v1.5.4 on Linux. I am using SSL on everything.

I am trying to create and delete test users from within the admin section.

And I can't. I click on the user, I get the panel with the user details, and when I choose to delete... nothing happens.

Oddly, if I choose "edit", I get the customer details form/page but if I press "update", all the fields go blank and ZC complains about missing mandatory fields.

When I look at the log, I see that I have been attempting to delete a user with ID = 0 rather than 777 as it should be.

Any ideas on what could be wrong?