Recently, Windows Update included a set of addins, including Office Live connector.

    That update extended my HTTP_USER_AGENT string to beyond 260 characters, which unfortunately IE then, when asked via javascript, reports itself back as IE 6 – this causes the Modal dialog boxes in SharePoint for things like adding web parts to zones to report a message that “Not enough storage is available to complete this operation”.

    This then causes error messages when customising SharePoint.

    This can be resolved (only if you are getting error messages) by modifying the registry. (WITH CARE!!)

    1. Go to Start -> Run -> RegEdit

    2. Go to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\5.0\User Agent\Post Platform

    3. You’ll have something similar to this:


      4.Delete a couple from this list (duplicate major versions, or ones you aren’t using). Mine then looked like this:


      5. Then restart Internet Explorer (including all instances).