This issue was posted twice by others a month ago with no resolution. This is with 2.7. The version drop down field in creating a new post here does not have 2.7 as an option yet.
When I click edit to change the time stamp nothing happens. The scripting error reported by IE I am getting when I click on edit to try and change the timestamp is:
Line 132 Char 2 Error Object does not support this property or method
I am using a theme (ADropInTheSea) which I can't even locate at WordPress anymore, and it's not listed as a compatible theme with 2.7
So I switched to a compatible theme and got the same error. I do not think this is a theme or plugin issue.
In Firefox I use the error console and it says I am getting a syntax error, specifically:
Error: uncaught exception: [Exception... "Component returned failure code: 0x80070057 (NS_ERROR_ILLEGAL_VALUE) [nsIWebNavigation.loadURI]" nsresult: "0x80070057 (NS_ERROR_ILLEGAL_VALUE)" location: "JS frame :: chrome://global/content/viewSource.js :: viewSource :: line 156" data: no]
Maybe someone who understands these error codes can say. My guess is someone needs to edit wp-admin/js/post.js or another file in that directory, but I don't know how.
Using the Firebug extension I can dig deeper if I know where to look, but I don't know PHP or JS.
Any help would be greatly appreciated as I blog off-line and add posts as I get them ready, sometimes one needs to be a day or a few hours earlier, and I can't do that anymore after the upgrade.