Fixer Theme does not save any changes have tried other themes work fine

I have tried all your others forms of support which to be honest are of no help at all, they seem to be more concerned with their points and rewards, if you do offer support then please use a system that actually helps people not confuse them more. I have installed one of your themes Fixer and was a clean install I have been sitting almost day now and unable to save any changes. I tried installing some of your other themes and they update and save fine but the fixer theme installs and allows you to make changes but trying to save them just shows error does not say what the error is or what to do to resolve it.
please advise