Existing Active Directory users cannot login to iFolder3, but newly created users work.

Active Directory users must have  "userAccountControl" flag on the user set to 544 (normal
user and password not required) iFolder is looking for a certain
UserAccountControl flag and will not allow login if it gets anything else.

Duplication:

Change the properties of the working user (go to Attribute Editor tab) from
userAccountControl=544 to userAccountControl=512, this immediately breaks the
working user.  Set the userAccountControl back to 544 and the user is working
again.

Go to the userAccountControl attribute of the existing AD user.
Check "password never expires" box, should work, 
or a value of 544 should work also.