App Icons won't refresh

Hello,

PortableApps is just flatout an amazing tool! One problem I'm having is getting the new icons to show up after I've installed new apps, such as GIMP, Putty, etc. I click on refresh in the settings menu, and nothing happens. Using this on a Win7 64-bit machine. Any ideas what I'm doing wrong?

If I browse manually to the apps, they run perfectly fine.

Thanks in advance!!