See, this always makes me skeptical, because I’ve been reading these forums daily for like three years now, and there are STILL messages I haven’t seen. 
Since you’ve opened an official support ticket by posting here, you can help Support get to the root of the matter much faster if you actually list each of the things you have tried, and what the result of each one was.
For convenience, here’s the official troubleshooting list from the Support website, and here’s another list compiled by some of the long-time forum members.