Just finished building a DVD with encore and went to play it Adobe Media Player which prompted for an update to AIR which I did. Then Media Player wanted to be updated so I did that. Couldn't get Adobe media player to play the DVD (I suspect it is not intended for that) so used something else. I started Premiere to work on something else and when I loaded the project it complained that ad2h264dec.dll was missing. I had to kill the premiere process to get rid of the message. Now when I start some projects Premiere says loading then crashes to a black screen. Not even a BSOD!
I should probably mention that some of the content on the projects that crash is HD which I scaled to fit. These were OK before this afternoon. I cannot find the dll anywhere on my system. I also have a trail version of Premiere CS4 installed with a view to using this for the HD content but have not been able to evaluate this due to MPEG 4 codecs not being included in the trail version.