Fixing a Failed Upgrade
In rare cases upgrading may fail to overwrite old files, resulting in random or bizarre behaviors and crashing. The fix for this problem is to completely uninstall Wing and manually remove remaining files before installing the upgrade again.
If this does not solve the problem, try moving aside the User Settings Directory and then starting Wing. If this works, try restoring files from the old user settings directory one by one to find the problem. Key files to try are license.act*, preferences and recent*. Then submit a bug report to firstname.lastname@example.org with the offending file.