I've made some pretty substantial changes to the alpha sheets behind the scenes, and to the Pathfinder [Legacy] sheet in particular. Please try clearing your browser cache, or post in the Experimental Features forum if there are any issues!
At this point, we highly recommend that all new Pathfinder sheets be created in the alpha and that existing Pathfinder sheets be copied into it via the 'Copy to Sheets Alpha' link in your regular sheet list
That's not enough information to work out what the problem might be.
I have reset the password and emailed it to the user. If the problem is their email address then they'll need to contact us directly. Giving out passwords for one user to pass along to another user would be bad practice.
EDIT: If the user hasn't seen the new password I sent they should check their spam box.