My ad blocker must not be good enough. I'll have to look into that.
Maybe it's not an ad blocker issue. I tried logging in from my phone (which I've never bothered putting an ad blocker on) and I didn't get any issues.
Have you done something to block your cookies recently. If so you may have to change your settings to allow cookies from this site... that's how they know you've been here before and signed in as a member.