I use the password manager LassPass to handle all my passwords (it would be a nightmare to do it any other way) and I'm finding these forums don't behave well when using LassPass. The normal behaviour is that if a user is logged into LassPass and then goes to a login page, LassPass will fill out the login form and the user can then just hit the "sign in" button to log in. On this forum there is no separate login page (which can be fine) and clicking on "sign in" brings up the login box but LassPass doesn't fill out the form. The user has to first click the field and the LassPass will prompt with a list of possible logins (I only have one for this site) and then will fill out the form allowing the user to click "sign in" and proceed. So several extra clicks.
On iOS 8 the problem is worse as although the LastPass extension will fill out the login form, submitting it causes an "invalid username, email or password" error. As far as I can tell the credentials are correct so I'm not sure what is going on there.
I know that the issue is relatively minor but as more people use password managers the forum software needs to be friendly towards them. It shouldn't be too difficult to fix and it would make my life easier and easier for others that use password managers.