Popup inside wordpress admin area

This is happening with FF, Chrome and IE.

The problem I’m seeing is, for example, you go into the plugins area and click Add New, then type in anything to bring up a list of plugins (i.e. bbpress)

It then gives a list of bbpress related plugins and you click “details” of one of the items on the list. It should open a window on top of your current browser screen with the information about the plugin. You can then close it and go back to the list of plugins.

However, what mine is doing is sometimes the pop-up window comes up, sometimes not, but then the screen clears and it lists the contents of the window in the browser (not the pop-op window).

This wasn’t a huge deal until I downloaded NextGen galleries plug-in and it uses that exact functionality to configure a page for a gallery (or galleries). So, the plugin can’t be used.

I don’t think it’s a particular browser setting as all three are doing the same thing. It used to work fine, so I don’t think it’s Windows 7. Could be a patch that was downloaded for the O/S?

Help? ??