I can tell you that much:
I have 2 UZB1 now which I restored my setup to.
The first one is firmware 4.06 and behaves the same as Aeotec with firmware 1.01 meaning it freezes during optimize.
The second one is firmware 4.61 und dosn't freeze. during optimize. So it seems to be obvious that the problem is in the firmware and not the individual setup.
Cheers
Wilhelm