I have this issue, after upgrading to 4.2 I noticed the following, if you are viewing session state from developer toolbar, select Application Items then Set, the application Items will appear in the following order
Application Item Value Item Name
101 ltr DIR
if I have a long value for an application item, so the Item Name column will not appear in the popup window it will be flushed the far right of the window, and you have to show the page in smaller font to see. That was not the same in previous releases. Or even in Page Items, I am not sure if this is a bug or by intention. I would prefer to see the Item Name first then the Item Values.
You will only see the items that only have been updated, there session state have been changed, sometimes you need to know, quickly what application items you have. I can't decide if this a bug or not actually, but I prefere to have the names before the values.