Hi again and thank you for your words of welcome!
I tried to convert and add formats in various possible ways and found out that:
You should NOT save the new format in the Calibre-managed library forlder.
This may seem an obvious thing, but the problem was caused like this: I filtered for the .doc format in Calibre, clicked "Path - click to open" (a Nautilus [explorer program] pops up), then I opened the file in OpenOffice and Saved As... - which meant that the new format was saved into the same folder. Then, for some reason, when Calibre copied the file over itself, it deleted all its content and left it with 0kB.
Adding new formats from files in other locations than within the Calibre library solved the issue.
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