Since Xffm 4.0.2, copying of a file hangs Xffm. The file is copied but Xffm hangs at 9/10 MB, CPU usage is 100 %.
Additional information: I recompiled Xffm with debugging and ran it in a debugger. Backtrace is attached, also a logfile with the oufput of Xffm in debug mode is attached.
Please replace file libs/tubo.c with uploaded file and verify if bug is gone.
Seems to work.