Judging by the RPT it must be stuck during the pausing of active modules. I'll need a (non PBO'ed) repro mission with a minimal modset (CBA and ALiVE) to check further. :)

Alright, the saving fails because you have a commander module that doesn't control any profiles causing the module to never fully initialize which in turn hangs during the pausing of active modules. The solution is to either delete the "useless" commander module or give it some profiles to control.

Also created a ticket on github -> https://github.com/ALiVEOS/ALiVE.OS/issues/211