I have the same problem. McStudio was working and I was able to program but now something causes it to crash on startup and I have unistalled and reinstalled and it does not fix it. Any ideas? See attached file for details.

With no files in the project, I wasn't able to reproduce this issue on the latest version of mcStudio (v0.8.399.0). I've attached it to this message and it's available at https://www.mcthings.com/downloads/. Can you confirm that you have the same version installed?

If the problem persists after performing the steps John suggested, send us your Settings.xml file and the .mcProj file that you were working on before the issue started and we'll confirm that they're not corrupted or anything.