Latest post of the previous page:
FC, I don't know if you can have 'Private Browsing' switched on permanently but if you can that could possibly be the problem.Added and further edited later: I think this may well be the answer to your problem FC:-
As I rarely use the iPhone these days for internet browsing I noticed that mine wouldn't autofill. I have just been playing around with it and I notice that when you touch the box where you enter your username to log in on a site and the 'on-screen keypad' opens, there is a line above the keypad that says 'Autofill password' and if you touch that, it then fills in the username and password. Note that the 'Autofill password' ONLY appears if you have previously entered and saved your log-in details on an earlier occasion for the site you are on. You can see which ones are saved by going into the 'Settings' then 'Safari' then 'Passwords and Autofill' then 'Saved Passwords'. By clicking on the arrow on the right of each of the listed web sites you can then see the actual log-in details saved. I assume it will be similar on the iPad.
I would seem that it doesn't fill in the details unless you actually tell it to. This may well be in case you wish to log in with another user name other than the one saved. I don't think this has always been the case with the iPhone so maybe it is something new that was added on one of the OS updates.