About a month ago I updated a DNN install to 6.2.2 from 6.1.x. Everything went well and everything at that time was working as expected.
Last week received a call saying that the login pop-up wasn't working, instead it redirected to a logon page. Also when clicking any of the links within the manage pop-up the page went grey but nothing was displayed.
A comparison between the DB/Site files just after the upgrade and now only showed some changes in the text for some of the HTML modules and nothing else.
Comparing the host jQuery settings between the upgraded install and a fresh 6.2.2 install I found that in the upgraded install the hosted jQuery URL was http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js where in the fresh install it was http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js after updating the URL in the upgraded install everything started working again.
The upgraded install started life as a 2.1.2 DNN version and has been upgraded over the years. It appears that somewhere in these upgrades the hosted URL was set to http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js. This URL points to the latest version of jQuery (currently 1.8.0), which has only just been released in the last few weeks. It appears DNN6.2.2 doesn't work with 1.8.0 resulting in the problems.
Just thought I should record it here, in case anyone else has the issue. I am also posting it to the issue log.
Antony