Sage 300 ASP pages do display properly in CRM V7.3

Sage 300 V2014 / CRM V7.3b / WIn 2012 R2 / SQL V2014 / IE V11 /

- I am just testing an upgrade of S300 & CRM to the above versions on my test server for a client.

- I have everything working fine except for the Sage 300 .ASP pages

- when I open any of these .asp pages - for example AR inquiry the left buttons vanish and the main detail screen is now right at the bottom of the screen

The is no scroll bar so have to use the mouse to drag down the screen to bring up the page..

- I have spent a long time searching forums, etc. but have found nothing

- I have checked IE settings (Note this problem occurs in both IE and Chrome)

- I also took the old AR_Inquiry.asp page from the older version where it worked and copied it into the new accpac custom pages area, but this did not help - thinking that it may be a bad .asp page.

- So it must be something else

Has anybody seen this before and what would the resolution be please