If memory serves correctly users where able to login using either email or username in a standard login form until a few days ago. The site uses zoo_visitor latest version and has been updated to EE 2.6.1 to handle the new zoo visitor forgotten password form.
Login using username/password on both Zoo and EE login forms is fine. Try using email and error:
The existing username and/or password you submitted are not valid
Any ideas? Is this because of the updates? My next port o' call is stepping through the php, thought id ask here first.
Thank you.