I tried several times export OMF from CS4.
Removed all effects, fades and timeremaps.
Splitted 3 parts, 10 minutes sequences.
Filled silence moments with offlines files.
Removed unused medias.
But always PPro frozen when export OMF.
And finally, i find the way. This is the ram issue.
Restarting PPro solves the problem.
Emrah Donmez
Istanbul, Turkey