I was running Rubymine 7.x and it the debugger was working fine, then upgraded to Rubymine 8, now the debugger doesn't work right.
The debugger will start up, even successfully render pages.
But...when it hits a breakpoint I set...I get this:
IOError (closed stream):
and it errors out, then becomes unusable at all until I stop the process...close the Rubymine application, and restart it.
I have this installed: