before! filing a bug report please! use the search in bugs to check if there isn’t already one or multiple reports which matches with your experiences … bugs is in a way ‘flooded’ with such reports, it doesn’t help to produce more duplicates, it could probably help if you can add relevant clue to existing reports …
@Frants: If you edit a question later, please make clear what you changed / added /deleted.
Otherwise already posted answers and complete sequences of comments may lose their meaning.
I hesitate to mention this but Windows 10 does have a built-in clipboard manager and it might be a workaround. Click Start menu > Settings > System > Clipboard > Clipboard History, switch to On. When you need an older item then Windows+V will bring up recent copies since last boot or its limit.
a little peculiarity of copy/paste that disturbed me a while ago: copy - paste with ctrl-c - ctrl-v from ex$el to calc: the formula is inserted, in the other direction (calc to ex$el): the ‘value’ is inserted, i.e. the result of the calculation of the formula, also from one calc version to another: ‘value’, while to another instance of the same version of calc: ‘formula’, does anyone know why?
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