Just upgraded to 7606 and now it wont load

Just upgraded to 7606 and now it wont load

Dear sirs,
 
I have just updated to 7606 of SDP and now it wont load. It says HTTP 400 Bad Request.
Is there any way of getting this back running?
 
This is kind of urgent as people will be using it tomorrow.
 
Kind Regards
 
Martin Storey

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