If you have a project that needs recovering you can send it to me at ashleygye@scirra.com and I'll see if it can be recovered (but I can't guarantee it always will). Remember it's important with any digital work to keep regular backups.
If there's a serious bug obviously we want to fix that, but we need a bug report following all the guidelines, because posts like this simply don't have enough information for us to act on. For example, does it reproduce in the latest beta release? Perhaps we already fixed it.