I have the same flickering problem with PM 5 Beta 2 when I try to ingest. It is very very slow and the screen flickers, at the moment I ingest using PM 4.6 then switch to PM 5 beta 2. I had no problem with PM Beta 5 ingesting, but had to uninstall this version because it wouldn't open, giving an error message. I am using Windows 7 Professional (x64), 12gb ram, AMD Radeon HD 6670 card