Trying to run the sge test, I loaded tm1.xml. I opened the motion plugin window and realized I have "Play every frame" unchecked. L'ho attivato. I closed the plugin window (with the warning message in red); I reopened it (message in green) and after a couple of seconds I had a crash with dump. I did it all again as root and got a crash with dump again, which I report in attachment. To be precise the crash happens when I move the plugin window to another position. If I don't do the checked/unchecked steps of "Play every frame" I don't crash, if I do I crash. At the terminal there are the following lines, but I always have them, not only in this case: unjoined tids / owner 3 00007f46e9502640 / 00007f484b7fe640 12RenderEngine 00007f4708540640 / 00007f484b7fe640 12RenderEngine 00007f46fb526640 / 00007f47f5ffb640 12RenderEngine On the occasion of the crash I have: ** segv at 0x556921190bf4 in pid 179611, tid 179707 writing debug data to /tmp/cinelerra_179611.dmp lock_items: 22 lock_frees: 7 ** dump complete