[libreoffice-users] extensions not shown completely

Good evening
I have LibreOffice installed on Windows and Linux machines.
I noticed, that while on the Windows machine "Tools - Extension Manager"
shows all installed extensions,
under xubuntu 14.04 the extension manager opens and shows the spelling
dictionaries, but not 4-5 other extensions.
Those other extensions ARE there, since when I try to "reinstall", the
computer asks me, if I want to overwrite them.
These file extensions show up fine under kubuntu 14.04.

Why are those extensions not shown?
Is there anything I can do about it?
Trying to "update" existing extentions results in errors like "file xxx
does not exist", or in case of a file/extension that DOES exist:
"error during file opening".

Where am I supposed to look for what?

Thank you
Thomas

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