I have cleaned the Nvidia shader caches one more time (I had done it last week) and I could land in Phuket with the full addon scenery and AI traffic with the A310, same time, same AIG traffic (80%). I have no idea though if it is the cause of the problem. I simply post this in case anyone else has this problem and wants to try it (assuming this is correct).
Should we really have to clear the Nvidia caches that often?