After loading the firmware, some VFO modes and/or frequencies were different. So I tried to reset the settings but unfortunately, the strange behavior with the '00 Encoder: INTEL' setting is still the same.
I contacted the Lab599 support explaining the strange behavior. I'll keep you informed.
I think it would be helpful if more users could test the VFO behavior with the INTEL setting and post their results on this thread. Maybe only some batches suffer from this problem? My rig is about two years old and origins from the first EU-shipment (S/N. TX5210503xxEU).
73 Stephan?