Unfortunately physicsoverflow is quite unused. The framework it is based on, StackExchange, is curently updated to version 2.0 and all rather inactive site, possibly including this one, will be shut down. However, a new site is already under preparation here, see here for an explanation of the process.
We hope that SE-2.0 will also include LaTeX support, as requested more than once. Please feel free to join and support those requests and the new physics proposal.