I just solved one very weird problem I encountered working with #Mixbus + #X11
I couldn't open new windows on my #UbuntuStudio #Linux 24.04. Not any.
Then I restarted the box and Mixbus and it wouldn't run no more. Full panic mode. Production URGENT.
What to do? As always: Restart again, open console window, start Mixbus from the command line and watch for debug output. And there it was:
„Maximum number of clients reached“
Or, to translate: Uh, you got too many windows on your system, hidden or shown, I'm giving up.
My recording project had grown by one channel, and thus by three more plugin windows.
The default client limit is 256 in X11. #xrestop shows I need 268 clients. Without Mixbus I was at 180 clients already.
Solution 1: Set max to 2048. https://forums.opensuse.org/t/how-to-increase-maximum-number-of-clients/170209/3
Solution 2: Mixbus has the (defaulted?) option to close / destroy plugin Windows instead of hiding them. But this may have other implications, especially when running Windows #VST on Linux.