Yes! Works! Thank you very much!
Ctrl+Drag for copying patterns in the editor crashes the program [admin@mainpc ~]$ lmms Notice: could not set realtime priority. Cannot load library /usr/lib/lmms/libcarlarack.so: (libcarlabase.so: cannot open shared object file: No such file or directory) Cannot load library /usr/lib/lmms/libcarlab...
Well, this:
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Instruments are there, but they're invisible for some reason
When i just start it from outside LMMS (zynaddsubfx -o jack) everything works normally

ps: update your forum, guys. 2kb limit for pfp? No image uploading? What is it, 2003?
Yes, that's the issue. "xset r off" workaround works. What's weird is: why did it work before why did it break and why reverting seems to fix it? :/ Anyway... If it works as i think it does: //Pseudocode: prevKeyDown = False while True: keyDown = isKeyDown() if keyDown and not prevKeyDown:...
...doesn't work properly anymore.

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I installed some older version and everything went back to normal.