I just thought I would note my recent experiences.
The original site was DNN 4.4.1
The first thing I tried was to upgrade directly to DNN 5.0.0, When I did this I and the upgrade log said that everything had gone correctly. I got an 'unable to load v13wstat3' error when I logged in. Also my existing solpartmenu in the old skin was missing as soon as I logged in (therefore I had no way to alter the skin). I manually changed the menu in the skin to that of the minimalextorpy skin but had limited success. For instance, I now saw the host menu but no submenus underneath it.
Back to the drawing board.
I restored the filesystem and database, and upgraded to 4.9.1. This time the menu worked and there were no v13wstat3 errors. So silly me I attempted to go from 4.9.1 to 5.0.0.
This time the menu worked, as did the rest of the legacy skin. However, there were a couple of other things that I now noticed
The host and admin menus are all missing their icons.
The different sections of the admin/host settings pages are inaccessible. I get an popup that states something along the lines of "Sys.webforms.pagerequestmanagerservererrorexception: an unknown error has occurred (500)"
The portalalias module on the admin settings page is broken (incorrect path). **I saw the bug late this afternoon and simply removed the module.
I then noticed when I toggled the control panel or the view mode for the page I get an "failed to load v13wstat3: the control tree must match..." message.
Oh yes, I almost forgot when did the layout of the listentryinfocollection change? I noticed that in a custom module the country/region drop-downs no longer interacted correctly because the "Value" field had change formats.
Tomorrow I think I will try to simply go to 4.9.1 and see what happens...
Anybody have any thoughts or suggestions,
Steve