v 1.2 interferes with FCKeditor file uploads

After updating to Admin Menu 1.2 earlier this week, I noticed that I was getting all sorts of problems with FCKeditor in both the display while editing a page and with file uploads. This was true when using the FCKeditor upload tool or IMCE, on both FF3 and Safari on MacOS 10.5.6.

After disabling the Admin Menu module, FCKeditor operation returned to normal.