wp_login_form() login inconsistencies

Hi,

I’m using wp_login_form() to generate a login form for a site I’m working on. The form renders and allows users to log in fine in most cases. However, for some users, when they login there seems to be some sort of a javascript error, and the page redirects to the “/wp-login/php” page with an incorrect password error. When on that page, the credentials entered into the wp_login_form() work.

I can’t find any consistent difference between usernames that work, and those that don’t. Most users that have this issue use their email as username, so maybe it’s related to the “@” or “.” in the username? Some usernames using those same characters seem to work however…

Has anyone encountered this issue? I was informed by the client that they were having login issues, and can’t pinpoint exactly when it happened, but it may coincide with upgrading to version 3.2.1 (my webhost automatically upgrades WordPress).

Any help is appreciated. Thanks!