Alright Nico, I think we are on to something. I was able to run a test corridor with standard templates and the tool worked. Additionally, I was able to get the tool to work with one of our side street corridors and in the same dgn that the tool would not work for our main corridor.
Digging in further, I created a new corridor with a side street chain/profile and applied the same template that we have had issues with and the tool worked...this leads me to believe there is something wrong with our chain and profile for the main corridor. I created a new corridor for our main chain/profile and used a standard template and the labeler tool did not work. Any ideas on what could be wrong with our chain/profile for the mainline. The name for both is "Harney_CL". I can describe the chain and the profile in COGO and they appear fine.