LynB and rharv:

Thanks for your suggestions. I tried using the Track menu to convert BB tracks to regular tracks, but it didn't make any difference.

I selected the 4 measures I wanted to regenerate and RB took about 30-45 seconds and then erased everything AFTER the 4 measures I had selected and did not regenerate the 4 measures I had selected.

This freature used to work for me very quickly, especially on a small section like 3 or 4 measures.

I don't know why it's not working now.

Silvertones: Any chance you remember the settings that you changed to get this feature to work?

Thanks.
John