One in a while ( on average once a day ), for no reason that I can see, the IDE becomes unresponsive after a build, to 
the point where it doesn't redraw itself. CPU usage is 100%, that last about 30 seconds.  To fix this I restart the IDE.


Using the System monitor ( Ubuntu ) I can see lots of instances of 
ntox86-addr2line and I think ntox86-c++filt.