After the 7.3.0 upgrade, I find duplicate portals folder for all my websites.
For example for the "33" portal folder it was created a "33-system" folder.
Now when I try to upgrade a skin (or upload a new one) it is uploaded in the xx-system folder, I can see it from the extension page, but not in the skin page (and in case of skin upgrade persist the old one). Only with a manual copy from the xx-system skin folder to the xx skin folder the problem is solved.
Other problem, in mostly part of portals if I try to load the admin/sitesettings page I get this error: "An entry with the same key already exists."
DNN upgraded to 7.3.1 version but problems not solved.