Syncing DevonThink ToGo, grayed out location on Mac List

I cannot sync anymore between my iPad and my iMac. The list of sync locations on the Mac shows the iPad, but it is grayed out and cannot be checked to sync. On the iPad, the iMac appears as a selected sync location.

Any ideas for fixing the sync?

Why do you want to click the iPad as a Sync location?
Do you have databases you’ve created on the iPad that need to be Synced to the Mac?
If not, you don’t need it checked.