After updating to 6.4.7.2, I could not open any files in my Documents folder! I then uninstalled it and reinstalled a previous version, and the problem was solved. Has anyone else had this problem? I am on Windows.
It is probably an anti-ransomware setting somewhere
Mac
You probably need to give LibreOffice full disk access from System Preferences > Security & Privacy. See this site on how to do it if you aren’t sure: Explained: What is Full Disk Access & Full Permissions on macOS Mojave .
Windows
If you don’t have a third party anti-virus have a look at this: Defender Controlled Folder Access
Allow LibreOffice access to Defender controlled folder
The below numbered list is from Use the Windows Defender Security app to allow specific apps
-
Open the Windows Security by
selecting the shield icon in the
task bar or searching the start menu
for Defender. -
Select the Virus & threat
protection tile (or the shield
icon on the left menu bar) and then
select Ransomware protection. -
Under the Controlled folder
access section, select Allow an
app through Controlled folder
access -
Select Add an allowed app and
follow the prompts to add apps. You
need to allow access to
soffice.bin
Or Turn Off Defender
Select Start > Settings > Update & Security > Windows Security > Virus & threat protection.
Under Virus & threat protection settings, select Manage settings.
Under Controlled folder access, select Manage Controlled folder access.
Switch the Controlled folder access setting from On to Off.
3rd Party Anti-virus
If you do have a third party anti-virus go into settings and then look for something like anti-ransomware or folder protection. Have a look at the blocked apps list, if you see soffice.bin in there change it to Allowed (you might have to read AV help if not obvious). Otherwise go to the Allowed Apps setting and allow soffice.bin, this might not be easy so you might have to add the different LibreOffice executables (Calc, Writer, etc.) to the Allowed list. Note that 3rd party anti-virus might make files Read Only so you can create a new file but you can’t save it subsequently. Sometimes, you might need to reboot after allowing a program access.
Cheers, Al
Many thanks, Al. I will follow your directions. Being technophobic, it will take me a while 
Not knowing what operating system, nor what anti-virus you have means it was a scatter-gun approach. Just one of the steps above will do the job, you know what OS and AV you have, you just have to choose the applicable step or let me know OS & AV. Cheers, Al