I think this might have been covered but can't find the post, sorry.

With the NVIDIA FX 1500 with the current and correct drivers insalled and performace set as per read me on MC2.8 there are a few open GL BCC 3/4 FX that cause field issues.

The ones that have given me trouble are advance lense flare and film process.  Using quality optimised render settings causes the 2nd field to blur slightly and the motion detect render settings reverses the field order.

All other effects seem to be fine.

 Working in PAL sd at 1:1 mxf

Anyone?

Sasquatch - I feel your pain,  Same FX, same problem - I've never found a solution

 too bad, maybe it will be fixed in an upgrade

 I have had this before too. I guess yoir  problem is that DV and SD 1:1 have the opposite field order in PAL and you have either mixed material on your timeline or have switched between 1:1 and other formats.

If you want to avoid the problem in the future stick with only one format throughout (transcoding footage if necessary) and selecting the right field order from the start.