I had a similar problem after reloading my library directory. What I
did to fix it was rename my library directory (Books) to Books.bak and
restarted fbreader. (Don't remember if I then re-created Books or if
fbreader created it for me when I restarted.) This re-created the
.fbreader cache directory. I copied the sub-directories from Books.bak
to Books and restarted fbreader. This time it was happy.
In my experience FBReader is not very good about detecting when its
cache is out of date.
-- Charles
I had a similar problem after reloading my library directory. What I
did to fix it was rename my library directory (Books) to Books.bak and
restarted fbreader.