Still works ok for me now on X2, but I'm on 32 bit Sonar. I still have to do an audible bounce to track to get audio into Sonar though. Simply selecting a region of track and exporting to wav now gives me a wav file, but the file contains a corrupted version of the audio from FL. I don't get that error message that I got in X1.
I think dubdisciple must be right. A real shame as Sonar with FL as VSTi seems to cover most bases. I'll regret moving to 64bit and losing this functionality.