upfront crashing

I have tried to install the fixer theme and 1 other one but can't get upfront to work. If I get it to make a change it has an error on save. It even crashed my computer. I have removed it and gone back to Genesis but would like to know if this can be fixed.
Believe it or not, it was kind of confusing to use. I would prefer the traditional way with widgets, etc.
Thank you