Error Rated 3 out of 5 stars

I'm receiving this error when trying to create an app out of Gmail in FF v3.6.8 (enable navigation, put shortcut on desktop):

"Couldn't convert icon to native format. Default icon will be used."

When I try to create an app out of, I click the "ok" button, but nothing happens - not even the icon warning.

Any ideas of what the problem may be?

Thank you

PS Prism works for me on my Windows 7 machine, but this issue is occurring on my XP work machine.