Rhino OSX

Zack, Thank you so much for your help.  It is working now after replacing 2.6.3 with 2.6.1.  I guess many people will face the same problem.

I am having the same problem Zack has.  I also have Mono 2.6.3 and not 2.6.1. Are there any ways to get Mono 2.6.1 and install to my Mac?  I have looked at older releases page at Mono project, but couldn't find it. Thank you,