Nope, one thing you have to look out for though, if you use a window other then thew posting window, and the gallery window, the script can be fooled at which window to post the info to.
Your best bet is to start your post, use the upload photos to open another window or tab to upload photos into then click the copy to post. If you have a third tab or window you mix in the mess, you can have the thing not work.