Paul
Thanks for your speedy reply to my last question. I have experimented a bit more and the problem appears to occur when the lgotemp@.exe is automatically submitted to c:\program files\salford software\ftn95\sdbg.exe. This generates an Access Violation notice which says' Instruction at address 10041a18 attempted to read from location 843709b8.'
I have also generated an EXE using the linker and then activated SDBG by clicking on the icon . This half works creating the right windows but with incorrect values.
I believe that this is a minor problem which could be resolved by making VISTA allow the submission of lgotemp@.exe to SDBG-how can this be done?
I note your suggestion that I upgrade to 5.10 to resolve this problem. If I use 5.10pe will this overwrite my 4.50 which is a full version. What changes have been added between 4.50 and 5.10?
Martin