Update to 0.5a. Changes:
  - Fixed accidental symbol pollution in Global`
  - Fixed & improved MSet error handling and reporting
  - other minor bug fixes
Private beta release 0.9b
Fix for 32 bit MATLAB w/ 64 bit Mathematica
Minor improvements:

 - Use SetOptions framework for the Force32BitEngine option
 - Allow resetting of init.m file to defaults from within MATLink
 - Other minor bugs & fixes

 RM & SH
minor fix for null string outputs
 - Remove checkcode function and error codes.
 - App is usable on MATLAB 2011a (and older?)