I'm sorry to come to this thread so late. I was hoping to wait until problems have been sorted but sadly that might take another couple of days.
I think Avbrief have modified their user authentication.
We have. In fact we've migrated everything to a completely different set of hardware in a completely different place, and a change to authentication was necessary as part of that move. The consequence was the suspension of guest (non-paying user) access, registration and subscriptions during the transition, and it's taken longer than we had hoped to restore these. Sorry. This was not well communicated in the alert message.
Subscribers should have not noticed a difference, other than a slightly faster site now.
This suggests that they are now using cookies, or using them in a different way.
We don't use cookies. I suspect your PDA may simply be caching the userid/password while your desktop browser asks explicitly each time.
Thanks for your patience
The (AvBrief) worm