yes rharv i just tried the render to wav files and volume changes are lost but no exceptions occurred. merge audio and midi tracks to stereo wav file works fine which is why i've had no problems. i stay in RB for a final mix and then merge to a wav file for mastering. my mix and mutes work fine.

still a bit confused about the OPs workflow. why mix and finalise in RB then export wav files to another program?

surely better to go straight from BIAB to the DAW of his choice but I don't understand the bit about not seeing which bar he's dealing with.

i'm not sure what he wants to do he can't do in RB. perhaps he can tell us and we can at least get him working happily on his music.

still it's another fix identified. and annoying that something that worked is now broken