Problems running debugger in PyCharm 1.1

I have a project that has been running well under the debugger in PyCharm 1.0.1 but spits out this error in PyCharm 1.1:

...
  File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/api/mail.py", line 30, in <module>
    from email import MIMEBase
ImportError: cannot import name MIMEBase

I'm not sure what else to add to this other than it's a Google App Engine project.  I have a feeling it has something to do with the way imports are being handled in 1.1 that's different than 1.0.1 but I don't really know where to start looking.  Any help with this would be appreciated.