Fortunately, IE7 is not my default browser.
In IE7/vista, when I click to add a widget, it appears on the right side of admin panel, as expected.
However, when Click Edit on the newly added Widget, it simply disappears.
I tried editing a widget that I had added in FF3. The edit appeared was accepted but when I viewed the page, this edit had clobbered the previous widget and sure enough, when I refreshed the admin page, it was gone.
I tried resetting IE7 completely to all its default settings and it still didn't work. I don't think it was a vista security thing because there were no security warnings.
So far, the plugin appears to work as expected in both FF3 and Oopera9.
Honestly, I wish IE would just go away so I didn't have to make things work in it for my clients!!!
jean