Mac browser error on login

in CW 2 Site-Admins Helping Site-Admins

One of our members keeps getting the error below when he tries to log in even though Javascript is actually enabled.  He can log in using the lost password one-time password.  He is using Mac OS 10.9.4. Firefox 32.0.3 and he gets the same result with Safari and Chrome.  Other Macs with similar software have no problem so it appears to be something in the environment of this particular compuer.  Any suggestions will be appreciated.