Alex,
I'm not sure what to report this under, if it is web controls or some other area or exactly where this originates from. I'm able to reproduce this in several scenarios: Upgrading to 5.0.0 from 4.6.2 and 4.9.2 where 4.6.2 and 4.9.2 were fresh installs. Also upgrading to 5.0.01 from 5.0.0, 4.6.2, and 4.9.2 where all three were fresh installs.
This occurs with Solpart Menu and DNNNav menu, so switching from one to the other does not make a difference. It occurs in skins that have only Solpart menu, only DNNNav, as well as skins that have both (but not both on the same page, just two skins in same directory). This happens with Minimal Extropy default skin as well as all third party skins I've used, about a few dozen to be exact.
My installs are local only using localhost, and have the "use port number" set in web.config with no other customizations. "Auto" install of DNN was chosen when installing any version. I use VWD Express 2005, but do not ever use projects or msi installs. I copy the install files to a directory, then unzip the install/upgrade file, then copy the contents of that zip file to a new directory, then load that directory as a website in VWD, open default.aspx and hit cntrl-f5 to load into browser window. I use the same install and upgrade packages you'd use on a live web site.
When the Admin and Host submenus are brought into view with mouseover, all the icons are broken images. On localhost, the path to those images is listed as: http://localhost:3633/dnn50/images//icon_hostsettings_16px.gif. Notice that there is a double slash after the "images" directory which seems to be the culprit.
On other submenus where the user has assigned an icon to the page, the icon is displayed fine from the portal directory without any problems at all and without the double slashes in the directory structure.
I have not tested this in a live production environment, so I cannot say for certain what is happening there, but this is an excerpt from a clients email to me about their production environment:
One more quick question. I noticed that the icons on the Admin and Host menus don’t show. Not that I really care about that, but it appears they are trying an invalid path for them, which gives a lot of 404 errors in the log. As an example, the path shown in properties to the Host Settings icon is /Portals/0//icon_hostsettings_16px.gif. However the menu images actually reside in the root/images directory. I actually noticed this in the previous versions, but forgot to mention it. The previous version however looked for them in /Portals/0/~/icon_hostsettings_16px.gif, as an example.
So, it looks like in a production environment/live web, it's trying to draw the default host and admin page icons from the portals directory instead of the images directory, and it still adds a double slash in the directory structure which could perhaps cause problems with some servers.
Not sure if any of this is helpful, or what section it should be reported under. I can at least report the localhost issues, but since I haven't used DNN 5x in production, I can only report from hearsay what it does live on the web which seems to differ somewhat.
So, with all that, what do you want me to do? I've not posted on Gemini before...