Hi Mark,

I haven't tried to render to mp3 for a few years because I tend to use variable bitrate and need other software to do that.

Today when I tried to render an mp3 using BIAB, I got the same error as you. In the past, I have successfully done this but it seems that something has happened between then and now.

Below is what I did.

1. I chose to render to mp3 and eventually got the below dialogue box.



2. Then, after choosing a suitable compression level and clicking OK, I got the following dialogue box.



To my mind, this is a bug because you, PWarren and I can reproduce it. It's something that PG Music should know about. I encourage you to email Support and to give them the URL of this thread as well as the thread by PWarren. By having those URLs, they can read through all that has been tried and it will help them isolate the issue.

Regards,
Noel

P.S. I also opened a different MGU file in Realband and when I tried to create a compressed file, exactly the same issue was encountered.