After creating a roadmap, and then renaming or deleting a picklist, you are unable to see the details of the Grid view, and instead see a message: "Loading Data...Please wait" and nothing happens. This may be noticed after you re-named a picklist. In doing so, you receive a LINK error and delete the picklist. Since then you cannot see the data in the grid view. You can see the timeline and board view in this roadmap.
Steps in KB Roadmaps grid unable to load view: "Loading Data... Please Wait" were tried. Other users can see the grid view without issue for the same roadmap.
Release : 15.8.1
Component : Clarity Roadmaps
This issue is no longer reproducible in 16.0
If that doesn't help, or if a permanent fix is needed, reach out to support providing:
Here are a couple of the picklist issues fixed in a later release:
API-1019 Error when trying to add choice to new picklist (Fixed in 15.9.3)
Local Picklist Value cannot be Cleared on a Roadmap Item (Fixed in 15.9.1)