Hi Terry,
well the good news is that it has nothing to do with the upgrades - this is behavior from way back.
so what's happened is the following;
a) you're developing on "one domain" - ie 127.0.0.1, and so cookies set by one app will be sent to other apps on the same domain. So if, for example, a Demo sets a cookie then that cookie is sent to all programs that you run with this URL address.
b) you're using the same login, and password field names as the examples (which is not surprising and not wrong.) But it means that the cookies set by one app are "matching" the field names used by another app.
c) at some point you ran an example which offered to "remember you on this machine" - and you ticked that on, so that set the cookie.
"solutions" are really easy, - just delete the cookies for this domain. Or re-run the example, and set "remember me" to no.
but it's not a "real" problem, it's specifically isolated to the developer machine as explained above, so nothing to be concerned about.
Cheers
Bruce