Okay....I started *totally* frm scratch. Downloaded a fresh 1.74 . Downloaded a fresh 1.744, and added that exe to the 1.74 folder.
I did not copy any files over from older directories
Started 1.744 and created all completely new files. Created new config settings, and a new 'other mame emu'. 'Multi' is enabled for both.
If I have the 'parent' Mala running, and start the 'nested' Mala, I get the 'Mala already running....' message. If I start the parent and then go to the nested Mala folder and start that one, I get the message again.
If I start the nested Mala by itself, and then go to the parent folder and start that Mala, I don't get the message.
I thought maybe the default debugging was getting in the way, but turning that off (and turning of 'show tips', just for good measure) in both, didn't help.
I moved the nested Mala outside of the parent folder, and changed the rom path for the nested one in the parent Mala. I get an error about path, syntax, etc.
I moved the folder back into the parent, changed the path data back, and I got that same error. I deleted the emu data, and re-created it. Still the error; it just won't load now.
I don't know. This is a bit wonky. It worked before you made it prohibited. It can't be my system, because I've re-installed the OS a couple times in the last six months, and 1.05 still allows extra malas as usual.