Welcome to the forum.
Can you give us a bit more to work with?
The Sequence Preset, and the full details of the source footage would be great.
The specs, and especially the CPU and I/O sub-system configuration would be useful too.
This ARTICLE will give you some tips on what might hold the key.
Thank you. Hopefully the following with be what you're looking for, if not
please tell me what other specifics you need.
Quad Core Intel Xeon, 2.66 GHz
Sequence is 1440x180, (1.33) at 48000Hz. Editing mode is HDV 1080p
This is a strange problem because it used to work fine a bit ago...
I/O sub-system. 3 physical hard disks.
1=1tb with 971gb available (captures reside)
1=640gb with 300gb left (projects)
Source footage is HD
Thank you much but unfortunately that didn't solve the issue, I didn't even
have the plist file to delete. BUT, on the lark that hardware might be the
issue, I updated the firmware on my graphics card, figuring it couldn't hurt
even though its supposed to already be updated, and it worked. Playback
Thank you all for your time and efforts