Version 6.6.9 RC2 won't run at startup

Hmmmm... After a couple of days I must unfortunately admit that the problem is still present, yet its occurrences are less frequent. In the meantime I've upgraded to version 7.0 and it hasn't helped - TLB keeps disappearing every couple machine power-ups.

Can it be the bug in the application itself? As I didn't experience such incidents with previous versions, I believe something must have changed in the program...