Debugging doesn't work with ruby-debug-ide 0.4.9 (latest)

Hi there

I upgraded my gems and debugging stopped working in Ruby Mine 2.0.1 (latest).  ruby-debug-ide was upgraded to 0.4.9.   I then reverted to ruby-debug-ide 0.4.7 and debugging started working again.

Is this an issue with RubyMine which can be addressed?  

Regards,
Olly