I found a bug in the Add worker feature on the site.
I was trying to add a worker with name 6870_777 (for my rig that has 6870 & 7770 cards in it). The Add worker button complained that I should try a different name.
I was able to add that worker when I removed the _ character from the name. However, after that I was able to rename the worker to use the name 6870_777 with the Update worker button.
So, either both of those features should allow underscores or neither one..
- Bitmong