I agree with Tim. Drill and Interpolate are both drill functions. With a Drill operation, the link will look in Tooling at Operation 1 and see if it can do the job. If it can't, it moves on to Operation 2. If Operation 2 tool can do the job, the link stops looking for a tool. It doesn't look for the "best" tool to do the job, just one to complete it.
Same scenario for Rout/Dado operations. Typically best to order from largest to smallest, unless you have a scenario of a specific tool to do a job.
If you cannot get it figured out, take an export from the link and email it to
cabinets@thermwood.com and I'll take a look at it. Just reference this thread so I have an idea of whats going on.
-Clint-