This is probably related to the old, bot not yet closed bug tdf#62196
It may need some time to study it in detail.
This, however, doesn’t explain anything concerning the question for what reason you experience the issue and I do not.
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Yes, it is very similar. I wish you an early solution to this annoying problem! Best regards!
Did you check with a virgin user profile?
How can I check this?
Sorry, I won’t be able to speak today.
https://wiki.documentfoundation.org/UserProfile
Be very careful concerning the backup to be sure you will not lose templates, user code, or something else. You may want to fully restore your previous user profile.
The problem was not resolved. What is done. 1 - The current profile has been renamed. After launching LibO, a new user profile was created. It did not help. 2 - Watching the Windows buffer (Win + V). Even when in the Clipboard window you select data for insertion that is different from that of LibO, Calc inserts its old buffer. After restarting, Calc sees the current buffer. But then the same trouble happens… LibO - get well soon! Best regards!
Very strange.
Cannot find a way to understand this behavior I never experienced though I often use every variant of Copy / Paste, of course, and even the respective methods getTransferable and insertTransferable by user code. Since also the user profiile wasn’t involved as you reported, I think there must be a subtle problem with your system.
If I was the victim of such spook, I would probably resort to a full uninstall / reinstall of LibreOffice.
Or: Is there any clearly uncommon software you have on your system? When did you last install something (except LibO 7)?
It is difficult for me to say something definite. Above, in the answer, there is a link to bug tdf #62196. It is unlikely that my software is similar to the software of those employees. Did they have Windows 10? You can see for yourself, so much time has passed. On my PC, the failure appears so far with one of the applications (unfortunately, I do not want to publish the name of this application). What is the specificity of this application (or OS, or LibO)? Unclear.
For example, today two windows disappeared from the screen - Calc and Base. Probably because I copied about 20,000 lines from Calc… 
Sometimes something is installed in the OS, the OS itself is updated. Everything is as usual. Maybe something new will appear? Then I’ll let you know about it.
Best regards!
P.S. On Windows7, the problem is the same, it has not gone anywhere.
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This is a LibreOffice problem, don’t encourage people to mess up their profiles or systems.
I had the same issue, absolutely could not paste into libreoffice text. After reading comments here, it seemed to me the same as others related, I could copy & paste from within libreoffice, but copy from another application would not overwrite the (apparently separate) libreoffice clipboard. On a hunch, I selected a single blank space from within Libreoffice, and pasted it into my document. That seemed to empty the clipboard and then I was able to copy and paste from the other application. It has worked normally since (so far),
As I am typing this, I notice to the right it says, “This topic has been solved>” Well, excuse me, I seem to have missed that. Something about an old not clearly related or solved bug and something about corrupt files that appear a horrendous mess to have to fix. Doesn’t sound “solved” to me.
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Yours is not an answer, at most a comment.
As it is a new question you should create a new question for it with details of your system and LO version, etc.
BTW From the sound of it probably you have a clipboard manager installed which is locking the clipboard, see Bug 136762 - LibreOffice does not paste after v7
This provides a quick workaround to the problem, which none of the other answers does.
LibO hasn’t a separate clipboard. There is an API interface XTransferable usable when programming (user/custom code) in LibO and working in a similar way, but not at all interacting/interfering with the system’s clipboard.
Strange behaviour in any relation to the usage of the clipboard should still mainly be suspected to be due to a once installed (and probably later incompletely “uninstalled”) clipboard manager. Some other “tools” needing to work near the heart (and the brain?) of the OS may also be culprits. Don’t touch the OS except by its own means.
No clipboard manager ever installed, n/a.
A funny aside, message suggests, “reply to this email to respond”. Return address is “noreply@ask.libreoffice.org” LOL
there are! copypaste issues,
see search for copy paste in ‘bugs’ - click to open
it’s more likely you suffer of one of them than you need to rework your system,
look around, find workarounds?, add clue,
next time first search in web and ‘ask’, this question has plenty dups and - insufficient 
- answers …
Needing to replace a probably corrupted user profile is very different from reworking the system.
When I first time had a (completely different) problem with the user profile I got the hint to try the “trick” from a forum -and it worked.
Corrupted user profiles are great in causing very strange problems, and if millions of users don’t experience an issue another user of the same software on the same OS suffers from, this is strange, in a sense.
There may, of course, also be a bug to that effect, but if not described reproducible, it can hardly be fixed. Software development still seems to be partly hazardous. MS proves this every day.
@Lupp: hi,
it may! be one user in millions … äh? did you count them?
in bugs there are 200+ entries for copy paste, 59+ of them i have listed as ‘relevant’, but i haven’t looked through them all yet,
ask throws out 83 pages! of questions about ‘copy paste’ (but the search in ask is not very good),
keep in mind that every user who finds his way into a forum and reports a bug represents up to 50.000 others - or even more - who have the bug but don’t report it, and behind them again up to 1000 times as many who have the bug but don’t notice it, and behind them maybe twice as many who don’t use copy and paste at all …
‘google index’ for ‘libreoffice calc copy paste’ with / without 'problem: 275k out of 258k !!, and that’s not all ‘no problem’ 
“apollo 11” 1,6mio from 11,7mio, “apollo 13” 875k in 4,1 mio, calc worse than apollo 13!,
if you visit a doctor with a wet nose during a flu epidemic, he won’t start with a colonoscopy but with the most likely …
@newbie-02: I woud like to assure you my esteem.
However, I’m a bit tired of this kind of insisting. You know that I cannot count the mentioned numbers. Simply discount my remark if you want. We will both not be able to change the policy concerning bug- fixes whether the bugs are proven bugs or supposed ones.
Some very conscious users of Calc I know from forums seem not to suffer from this supposed bug.
Some very conscious users of LibtreOffice experienced issues due to corrupted user profiles.
Some of them suggested to try a user-profile reset, and some got an ACK+ for it.
In a few cases also Lupp hinted this kind of corruption as the possible background of strange behaviour of LibO, and in some of these cases, the questioner tried, and a profile-reset solved the issue.
Therefore I still hope, @Frants will report if he succeeded based on my hint. As long as he didn’t I will regard the question open.
@Lupp: let’s not argue, let’s work together for a good project, you have good experiences with profile resets, i have none, i have experienced that ‘tinkering’ with the profile by ‘non-professionals’ led to rather unwanted effects … you have the impression that some mistakes are due to the ‘special situation of the user’, i have the impression that too often users are kept busy with requests and ‘standard suggestions’ instead of finally eradicating old known bugs, you? - most developers! - expect ‘stable reproducers for unstable bugs’, i suspect - and find again and again - bugs in places where others think they have been fixed …