Sage final accounts online corporation tax

I've recently changed from SAP to Sage fnal accounts online. I have found a few niggles which are driving me crazy. i have sent feedback to Sage and i'm sure they will sort them out eventually. 

My biggest problem currently, is with the Corpoation Tax module. Every time i try to open it in a limited company , it just shows error 500. My account manager is working tirelssly about this  and has be advised that Sage is working on this problem as i type. This has been ongoing for at least 4 weeks.Has anyone else come across this problem and how was it resolved. 

Perversly, if i logged into a sole trader, i can access the CT module without a probem. How can this happen in a sole trader when i can't do it with a limited companyy