No problem, thanks for the reply and the offer of using the latest beta. Much appreciated.
As it happens since my last post I have tried to solve the problem myslef and somehow I believe that I have succeeded as I have v5.0.1 working fine now. I think that the issue was that I tried to install it over v4 and as I detect that v5 is built on a different base from v4 (I believe the core is common with Zentimo?) I suspect that something clashed in the upgrade.
I finally uninstalled v4, cleaned my system's Registry to make sure all traces of v4 where gone and then installed v5...and that seemed to do the trick...no issues s far and v5 working like a dream...as did v4.
So again, thank you for your response, and please excuse the harsh words of my previous post...that were born out of frustration at the time.