I tried. Fails again with a segfault: Thread 1 "filelight" received signal SIGSEGV, Segmentation fault. 0x00007fffe50d14c1 in RadialMap::Map::paint(bool) () from /usr/lib64/qt5/plugins/filelightpart.so but I'm not sure how reliable that debugging information is given that I have older debuginfos for the newer binary. Calling it with explicit '/' still works. I wonder if it's about a special mountpoint that confuses filelight.