Can\'t edit a task (causes a browser script error)

Can\'t edit a task (causes a browser script error)

I'm setting up my first project and would like to use zoho but after adding 4 tasks i can no longer edit a task. Clicking the pencil causes a browser error to occur:

Line:7
Char:105058
Code:0
Error:Can't move focus to the control because it is invisible, not enabled, or of a type that does not accept the focus.
URL:http://arc.projects.zoho.com/login.do

I have restarted the browser and tried IE7 and maxthon.

This is a show stopper for me And i will need to use an alternative tool if i can't resolve this reasonably quickly.

Any ideas?

Thanks
Adam
adamwallace.email