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Quick update:
The problem magically went away after I had to switch from the free open-source "nouveau" driver to the "nvidia" proprietary one (for reasons unrelated to calibre).
I launched calibre after rebooting... and calibre was using oversized fonts that looked more like 14pts than my preferred 8pts. I proceeded to reduce my default calibre font to 6pts (!) under Preferences→Look&Feel (?) and after a restart all the fonts were the "right" size again (except perhaps for the metadata blurb to the right of the calibre display.. somehow a slightly larger font is used)...
So I thought... hmm... let's have a look at the books in the 10000+ range.. and lo' n'behold.. all five columns are now correctly displayed.
Since it looks as if this issue is more of a KDE/Qt problem (or running KDE/Qt based applications on an otherwise Gnome/GTK environment more like..) than anything to do with calibre... I'll leave well alone and not pursue this further.
CJ
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