Ruby debugging in IDEA 13 extremely slow

Once a ruby breakpoint is hit, it takes about 20 seconds for the UI to populate the debug area and that continues everytime I step or try to expand a variable.

It is essentially unusable.

I've seen recent reports of this happening in the RubyMine forums and as a result I tried:

1. Disabling "Read frames of non-suspended threads" in Settings.Debugger.Ruby

2. Moving the .IntelliJIdea/system directory and letting that get rebuilt.

Neither of those helped.

I am on Windows 7 and have a teammate experiencing the same problem since he upgraded from IDEA 12 -> IDEA 13.

Any thoughts on what I may try?

Thanks!

Jim