Thanks! Unfortunately there was an error while Spine was trying to record the error to the log, making it difficult to see what went wrong from the log. That's pretty rare!
In 4.0.61, I'm able to open a project, then the same from the recent projects menu. There may be something happening slightly different on your computer. You could try to delete your Spine user folder (or move it elsewhere), which will reset your Spine settings to their defaults. You'll need to enter your activation code again.
Spine Troubleshooting: User files
Are you running any anti-virus or anti-malware software? Another program modifying Spine could cause a problem similar to what your log shows.
