Stereo Mix off by 4 frames

[cccppprrr]

Has anyone experienced making a mix of track and finding that the file is late by about 4 frames? I've been mixing in DP for years. Since working in DP 7 I've just noticed a mix that should be in perfect sync with the MIDI file is late by 4 frames. So a MIDI event that is recorded at 1:00:00:00 when dumped down to audio is being recorded at 1:00:00:04. Is there a setting I missed or something that was always working in the previous versions of DP. It's not a hardware issue as my mixer is running with no (discernable) latency. My buffer is set at 256, but DP should be compensating for that slight delay anyone, which is nowhere close to 4 frames. Any ideas?

[James Steele]

Internal VI's are off? I'm assuming you're not using external modules that might account for some of the slop?

[Tim]

Is this a BTD, real time via internal bus, or audio interface inputs?
I've had BTD make things a few frames early.

[cccppprrr]

there are a bunch of vi's playing but they are playing at the right spot. only a mixdown makes the files delayed by 3-4 frames (meaning the recorded audio is behind the MIDI track if you play them simultaneously). so there is a delay created somehow on the audio recording. i'm going through an aux track with some other plug ins before going to the audio track but I did all of this in previous versions with no lag. and using the same basic template I've been using for a long time. so this doesn't make sense to me.