Thank you for posting Bet.
Unfortunately I have tried this and the same issue still arises.
Thank you for responding Ipstenu.
I have been in contact with Sucuri all weekend and they assure me its not there software.
I have also checked myself by turning Sucuri off and deactivating its proxy firewall as well as the website monitoring.
Sadly even with it all turned off it still will not allow me to login.
Kind Regards,