Hi – I use some software called Raylight. Its designed for exporting back to P2 card. I find its very good and it alows you to edit P2 footage with ‘link’ files (aka Proxies).
I have found this is the only thing that works when applying any effects or filters.
The only thing that sux is there is problems with exporting footage that you have modified the speed of. It goes all flickery. If anyone finds a solution to this – please let me know