I'm still on stack 8.0.0 so it might have been fixed since. I have noticed that if the other side de-asserts CTS the Nordic code will leave the TX asserted in a Break condition. In the past I have had some patched code that I have been trying to clean up and get back to stock and wanted to see if people have seen the same thing and if it's been reported as fixed in a later stack. I have some issues with Stack 11 right now so I haven't been upgrading until I figured them out. If there is a fix in an earlier stack I can try and do a two step upgrade path.
-Jim