I had a similar problem with round robin as i was only able to pass single keystrokes even after adding all the combinations to the RR list.

I resolved this by reconfiguring the Do Not Pass list. I had been using it in white list mode, where i entered in all the keys that wanted it to pass. I removed everything from the list and unchecked the white list option. Once everything was being passed i tried RR again and it worked fine. Set a few keys back to do not pass, and all is good again.

Are you using a white list?