When IE7 first appeared I downloaded it to run some tests, but noticed some odd and very annoying behaviour in my old version of Dreamweaver MX6 immediately after installing it, javascript errors being reported at every turn. Not having the time to investigate properly, and reading that IE7 was causing all sorts of problems at the time, I uninstalled it and the Dreamweaver problems vanished.
Recently, however, I needed to download it again to check some sites, and again, the old errors returned immediately. They were varied, but the most persistent was :
While executing Browse_Back enabled in toolbars.xml, a javascript error occurred.
As before, I couldn’t find much reference to the problem, but then stumbled upon this page, which links to this help file on Adobe’s site, which blames a .dll that Dreamweaver and IE7 share. The help file is for a different, but similar problem, but following the instructions solved my particular problem too.