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can't access pastebin atm. sorry. but does it sound/look related to some insert plugin like this stacktrace i could manage to reproduce?

Thread 5 (Thread 0x7f858c88d700 (LWP 3703)):
#0  0x00007f859db5ee6d in waitpid () from /lib64/libpthread.so.0
#1  0x0000000000433d3b in stacktrace (signo=11) at qtractor.cpp:302
#2  <signal handler called>
#3  0x00007f859d0ee58b in memcpy () from /lib64/libc.so.6
#4  0x000000000048f66b in qtractorInsertPlugin::process (this=0x1149bf0, ppIBuffer=0xe3c6a0, ppOBuffer=0xe46d50, nframes=1024) at qtractorInsertPlugin.cpp:367
#5  0x000000000051234c in qtractorPluginList::process (this=0x1149070, ppBuffer=0xe3c6a0, nframes=1024) at qtractorPlugin.cpp:1397
#6  0x00000000004451bc in qtractorAudioBus::process_prepare (this=0x1148e40, nframes=1024) at qtractorAudioEngine.cpp:2159
#7  0x000000000044048f in qtractorAudioEngine::process (this=0xa96c30, nframes=1024) at qtractorAudioEngine.cpp:751
#8  0x000000000043f048 in qtractorAudioEngine_process (nframes=1024, pvArg=0xa96c30) at qtractorAudioEngine.cpp:138
#9  0x00007f85a40923e7 in jack_client_thread_aux (arg=0xd06f40) at client.c:2055
#10 jack_client_thread (arg=0xd06f40) at client.c:2123
#11 0x00007f859db56a3f in start_thread () from /lib64/libpthread.so.0
#12 0x00007f859d14067d in clone () from /lib64/libc.so.6
#13 0x0000000000000000 in ?? ()

cheers

EDIT: the issue seems to be caused mainly by inserts on input buses only. tracks and output buses inserts seems to go all the way just fine. i won't tell that's your mistake, as there's certainly a crash-bug in there that i must look closer ntl. however, i'm feeling afraid to ask why you thought to insert standalone jack applications on input buses? wouldn't it be preferable to record all raw signals and then process it later on demand, like inserted on a track or even on output buses instead? k. you're using guitarix so you probably really want to record your guitar after fx- nice. then why you don't connect the output of those processors to qtractor inputs instead of making it an insert? oh- i see, you want to save the whole session connections through qtractor facilities. is that it? ah. how we all need a real good session management these times :)

EDIT 2: if you your session to load, please try to edit the .qtr by hand. fire up your favorite text editor and look for any of these xml entries:

then, under each one of those, look after these:

and substitute that by this

save and you should be fine now. until next time ;)

hth.