I have installed the most up to date version of the People+Connect software from the site (v1.2.3). Many times, when I click anywhere on the screen other than the dialog box, the dialog box disappears! It is still running, as it shows an item in the taskbar, but when I right click, the only options are to move or close. Move doesn't allow me to do anything, so I usually end up closing it, then "running" the software again I order to interact with it again.
I couldn't find any configuration options, so I'm not sure if there is a setting that is causing this problem. It is running on Windows XP.