Im running mediaportal (just downloaded the latest beta last night) with PowerDVD 8 as my decoder for H.264.  (Running 2x DVB-T CardS) All was working perfectly on my old TV (28" Wide Screen CRT) but Ive currently got a 42" LCD running at 720p..  All other channels work perfectly (TVNZ / Prime Freeview) but since Ive installed the new TV the mediaworks sound seems to be slightly out of sync - not enough to put you off but enough to make talking look real stupid! Ive checked signals, switched the mediaworks channels to my other card just in case,  installed a newer version of Mediaportal (MP 1.1.00 Beta 1), installed the latest SAF but havent had any luck tracking it down!  Anyone got any suggestions?  

The equipment running it all is as follows:

AMD Athlon X2 5400+ CPU
2GB RAM
320GB HDD (I use my server for any real storage)
2x ASUS PCI DVB-T Cards (these have worked perfect for a long while)
nVidia GeForce FX 8500GS (these work fine with freeview btw)

Im thinking maybe vid drivers - I cant remember if I upgraded the old ones when I changed TV's or not.  If I did it'll be running the latest off the nvidia website.  Sound drivers are the same as they always have been (using SPDIF anyways).  Like I said all the TVNZ channels work perfectly.  I also have a feeling when I turn AC3 on the audios synced correctly - I wouldnt quote me on that though! I may experiment with it again tonight.