hat are you doing with the Variant in your UIMessage callback? You cannot just do a Variant to Data (like you would expect). You have to access each piece individually (kinda painful).
I learned my lesson back in the day: https://forums.ni.com/t5/NI-TestStand/Pass-Cluster-Type-Value-from-TestStand-to-UI-Using-TestStand-A...
Hope this helps,
