So poking at this for bug 76239, which lead me around to bug 68194 I'm not sure we have things correct on the Windows installer. I manually cleaned Windows 7 sp1 64-bit or all LibreOffice fonts, and verified not winsxs GAC residual. C:\Windows\Fonts empty of all fonts, no remaining linkages in Windows registry. Install clean LibreOffice 5.0.0.5, CLI msiexec.exe /i run as administrator, with verbose logging (attached). full slate of LO external fonts are present. Launch LO and fonts are present. Uninstall LibreOffice 5.0.0.5, CLI msiexe.exe /x run as administrator, with verbose logging (attached). The LibreOffice installed fonts are NOT removed from C:\Windows\Fonts Uninstall logs seem to suggest there is no action performed against the fonts which are listed as Installed: Local Action: Null Don't think the installer is behaving as intended, i.e. regards themsidbComponentAttributesSharedDllRefCount, with the work done for bug 68194.
Created attachment 117792 [details] LO 5.0.0.5 msiexec verbose install log
Created attachment 117793 [details] LO 5.0.0.5 msiexec verbose Uninstall log
So, guess the point of all this is that we don't seem to have the logic for handling registration into the C:\Windows\Fonts directory correct for installation (recording details for uninstall) or for doing the uninstall.
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Will recheck, but believe this is resolved WFM, have not had this issue is some time. Sorry for letting it rot.