I don't what I did, but everything works fine now!
1. I removed the (2) 30A blade fuses from inverter (INTELI POWER 9100 - model PD9160A). Both were good and I reinstalled.
2. I opened up the ATS box (same one as image above - IOTA ITS-30R) and insured all connections were tight. Nothing loose. I pused on contacts several times. Nothing stuck. Closed box.
3. I switched generator 30 amp switch off and back on. It was not tripped.
4. I plugged in shore power. Turned on lights and they worked. Tried AC and all good. Micro, TV amd all 12V items worked as they should.
5. I unplugged shore power. Turned on genny. Waited a minute. Turned on AC and it worked fine.
Everything is back to normal.
What could it have been?
Thanks for the support!