Today I noticed an issue with InfoPath browser forms on SharePoint 2013 the People Picker “browse” icon not launch the find people dialog. Below are more details. This was tested on both version 4551 (October 2013 CU) and 4569 (Service Pack1) where both failed to launch the people dialog in a full screen form with the toolbar hidden. This does not appear to be fixed in any CU or patch that I’m aware of. Below are the test cases and results that I performed.
Hopefully Microsoft can include a fix in a future release.
Toolbar Hidden in full screen mode (FAILS)
Toolbar Visible in full screen mode (WORKS)
Toolbar Hidden embedded in Form Web Part (WORKS)
Toolbar Visible in Form Web Part (WORKS)