Version: 4.1.4 (using 4.1.4 (KDE 4.1.4), Gentoo) Compiler: x86_64-pc-linux-gnu-gcc OS: Linux (x86_64) release 2.6.26-tuxonice-r4 It once occurred to me that my disk was full while KTimeTracker was running. Then I freed some space and quit KTimeTracker. Since that time, KTimeTracker has always been claiming "Could not save. Disk full?" on every save -- even though there is enough disk space, and indeed my time tracker file is saved successfully. Could this bug have been introduced when "fixing" bug 152456?
I suspect a stale lock as described at http://userbase.kde.org/KTimeTracker/Developing#How_to_reproduce_a_stale_lock
Indeed, that was the problem -- thanks!
Problem solved, I guess we have to live with the fact that stale locks can occur.