Yes I think it was 3.0 and the pvd was empty.
To be sure I put 3.0 in a WS and made sure to change some settings and save(because the WS had a newer FW before) while also making sure that I had not set username nor password. After verifying that 3.0 did not require username/pwd I upgraded it to 3.5 and it worked ok, i.e I was still able to access it without username/password. That is how it is supposed to work, so I still puzzles me what you are seeing...
A possible workaround for you would be to save settings(bin) using v3.0, upgrade to 3.5, use Setup Manager via USB to "Set default settings"(=no username/pwd), re-enter IP etc using Setup Manager and finally use the web page again to import settings. (I also tested that to be sure it works)
What about the Windows phone app "Not supported by Webswithc"
I did not forget, I just thought we'd focus on one thing at a time
You need WS v3.1 and newer for the rotator feature.