100% agree that this script error has to do with the PPP banner.  I have also updated the QB preferences to turn off pop-up messages, to no avail.  This is super annoying and I hope Intuit fixes this issue.  I am also not willing to change my default browser to Internet Explorer.  I highly doubt that would solve the problem, as my default browser has never been IE and I was not having this script error issue until the PPP banner showed up.