It was connected with latest change in ctrllib.usc file. I had unfixed version with buggy line:
ctrl Option {
...
Text SetLabel ? @1 "Option text" << should be @1 ?
...
If that line was "broken" and any lay file was selected then after each refresh of project (after moving items on list or closing/opening groups) in console appeared..:
error in parsing line 331 of ctrllib.usc (or sth similar..)
and that had to cause some kind of memory leak (theide ate all my memory) and finally ide hung up..