Hi Chad,
I'm having the same issue-placing the mouse over the Info Icon does not show me the Field Information. See page 17 paragraph 4.2 (Viewing Field Info) of the 3.4 User Guide
It worked OK before with the previous version 3.40.41. I have updated to 4.00.11 with DNN 06.01.03
I really liked this feature as it gave me a quick look at the Field Info.
Thanks,
Gary