LibreOffice (calc + writer, other not tested) blocks other applications from opening the clipboard (calls to OpenClipboard fail, because LibreOffice has opened it and not closed it).
Steps to reproduce:
Create a program that calls
// Set/get some clipboard data
OpenClipboard fails sometimes (e.g. if calc or writer is open).
If you check who has opened it with GetOpenClipboardWindow you get a window handle from the LibreOffice application.
Entirely possible this is the case, but it *IS* transient. If it were occurring always, no application other than LibreOffice would be able to access the Windows clipboard--i.e. EmptyClipboard and issue the WM_DESTROYCLIPBOARD message. That clearly is not the case.
You are probably aware that the behavior of the clipboard can be altered considerably by a "clipboard manager" holding the clipboard the clipboard and intercepting calls from other programs. Do you have a clipboard manager installed?
Feel free to review the LibreOffice source, the Windows build clipboard resides in /dtrans/source/win32 with calls to SystemClipbaord.idl and XSystemClipboard.idl
The MS API and documentation is here:
I do believe LO implements just a subset of MS Clipboard API, and there certainly room to improve our interaction--up to and including a LibreOffice clipboard manager bundled extension (to service Linux/Windows/OS X).
Similar OS specific clipboard issues on Linux, bug 48783 and on OSX bug 49853 or even related Windows clipboard issue(s) of bug 62196
this is not a blocker in any sense
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