Workflow Save/Publish Error

Hi,

We recieve a "Server was unable to process the request --> Values does not fall within the expected range" error whenever we try to save or publish a workflow on one of our subsites. This error comes on all the lists on the site on any workflow.

All the other subsites work perfectly fine. Things we have tried:

1. Deactivate/Reactive the Nintex Workflow feature on the site

2. Create a Sharepoint Designer Workflow on the site. (This workflow works fine)

The strange thing is even though we get the error mentioned above, when I try to see the Workflow Settings for the list, I see the workflow appearing on that page. When I try to click and view the workflow, it says cannot view the workflow.

Any ideas/clues?

Thanks,

Saurabh