WhatPulse Crashes in Multi-user PC

I’m using Windows 7 64-bit with 3 other users. I run WhatPulse on my admin account, then the other users log in after me (after I’m done using my computer). When I log back in again, WhatPulse Geek Window is not responding with a blank black window. Either the main window is not responding, or does not register any clicks/keypress. I have to restart the client to make it work again. But when another user logs in (fast user switching is enabled) the same bug happens again