We have this strange behaviour in the Notes client. We work a lot with embedded views and tabbed tables. Always worked fine up to Notes 8 (8.5.1 FP 2 to be exact).
Some (!) users experience a lock of the application when clicking in a view. After putting focus on a document in the embedded view all other navigational functions (tabbed table and hotspots) stop working. Re-opening the application/database solves this issue, but is very annoying.
Also referencing to issue with feedback number WEBB7R3SXP:
Any help highly appreciated!