Apologies to begin with, this is the third thread I'm touching upon this, but I didn't find this thread until now and I guess this is where it belongs.
Using the script seems to corrupt my file and I can no longer save without a crash. If I only use the regular conversion without checking 'convert Proxies' I can save as normal so something happens in relation to this conversion. I have a scene with Vray proxies distributed by FPP 5.05 and although the conversion appears to work, the scene becomes unstable and will not allow a save.