If you receive an error when connecting to Facebook from within Phixr, then the reason is the following: The nice folks of Facebook have obviously invalidated all off-line-access-tokens older than a certain age.
They probably did this following media reports about a “catastrophic security leak” in the last few days.
The solution is easy: Go to Phixr’s main website, click on “Settings”, then “Set up Facebook”. Then simply follow the instructions to renew your Facebook-authorization. This has to be done only once. After that, normal service is restored.
And please don’t worry about any security issues: Phixr is using Facebook’s newest security scheme (and has done so for a while now). Using Phixr is safe and not subject to the reported security leak.