Originally Posted by palbion

I had the same problem but I have a quick fix that appears to be working.

I quit other applications to avoid confusing things, set the system clock back by 24 h, started OmniFocus without incident, set the system clock back to correct time and still no problem with OF.

If OF checks for a licence only on launch (reasonable approach) then if you can launch it 'before the licence expired' it may be possible to keep it going until the ninjas can get it sorted.