Can anyone help? I am getting a jerky picture with Nebula DigiTV. I know a few people have had this problem already and I have read their solutions. I have also contacted Andrew at Nebula support who was extremely helpful (as always). I was using earlier software versions and managed to fix the jerky picture by changing the ACPI driver as suggested. This gave me a completely smooth picture (even on detailed panning shots) but now seems to be giving me glichy playback on Power DVD 4. Has anyone else had this problem when using Power DVD? I have now upgraded to 3.03 version software which states that the ACPI drivers do not need to be changed to get smooth live playback but am getting the jerks again. The odd thing is when i record a prog to the HD and playback using Nebula's software the picture is smooth. This leads me to think it is a problem with the card/drivers. I think it also rules out refresh rate/sync issues. Have tried various options within advanced settings but nothing has changed. My system is a P4 2.4GHz on a Gigabyte 8KNXP with 1024mb RAM, a Radeon 9800 128mb and Windows XP home. I think the Nebula system is the best on the market so i don't want to change to another card. I also don't want to change Power DVD. Any suggestions?