Plesk blank page after attempted upgrade

[fishface]

Am running 7.5.4 and I tried the updater in plesk for 8. This didnt work but nothing seemed to be amiss. However later i found that horde users got failed login. I solved this by reinstalling all imap and horde packages.

However i get a blank page when logging into plesk. Its okay if you refresh as the icons then come up with you logged in. But dont really want incovenience of initial blank page. Same happens when you log out, and ive noticed blank pages coming up occassionally within plesk, eg after restarting services or other stuff.
Anyone help?

 

[dynaweb]

Have you tried it in a different brand of web browser (or from a different location)?