I was careful for the first 100 hours, keeping settings below 50%. When I hit 100 hours I started to play more games but tried to keep static displays in them to a minimum. Most times any IR I found was only noticeable on blank inputs and they would take anywhere from 5 to 60 minutes to disappear completely (usually used the break-in images on loop to do this since I don't have any cable tv at the moment).
I recently got Assassin's Creed on PS3 and after playing the game for two 1-2 hour sessions noticed that the health bar was visible not only on blank input but also over darker scenes in movies (like Batman Begins, Dark Knight etc) from my regular viewing distance.
I've been avoiding playing the game again until I clear this up, but after about 12 hours of trying different materials (running break-in images on SD card [which normally worked for removing HUD traces from playing GTAIV], scrolling white bar and just watching full screen content on blu-ray and DVD), the IR is still there.
Here's a pic to illustrate (top photo is unchanged, middle I altered levels in photoshop to make the outline easier to see and the bottom is a screen shot of the HUD from AC):http://i3.photobucket.com/albums/y97/Merc_2k/ACIR.jpg
(The image above makes the IR seem lighter than it actually appears to me on my set)
I'm afraid to play after this sort of thing happened.
Is this sort of thing cumulative? If I were to continue to play games with static elements in them, without completely erasing any IR in between sessions, would it continue to build until it becomes visible over bright content as well?