Flashfire won't run

So I updated my rooted S5 to BOG5 a week ago using the process in the General forum with Flashfire. Now, after the update the phone appears to be working fine but Flashfire will no longer run! I've deleted cache and data for the app, uninstalled the app and tried v.19 and then also v.21 and the same thing happens each time - the Flashfire screen opens and then immediately closes with no messages or errors.

then I read around on the forums here and find a tip to set the date and time to 2013 manually and it runs just fine! this never happened before the update to BOG5... anyone seen this and know why it is suddenly exhibiting this behavior?