I recently upgraded to AMC 6. It's on a new Dell 5500 with 64 bit processing.

I discovered a most bizarre problem.

I tried to create a simple graphic in Title Tool and the first time I tried to save it, the computer froze. After restarting AMC, the second time I tired to save it the "Creating Uncompressed Media" menu popped up and stayed up, rendering. Each second of render just added another second at the back end, it would still be rendering if I didn't shut it down.

Opened the project again and tried using Marquee and had no problem. However, when I opended up Title Tool again, this time I checked the "Persist" Box and now it's happy. No problems.

what are your specs? Detailed: Hardware and software