Try issuing

CLOSE ALL
CLEAR ALL

commands before recompiling your project.

>Yes, tried different logins, admin etc, different directories. I'll try the debug and see what happens
>>Hi Neil,
>>
>>Launch Debugger before build and check build log in the Debug Output window to see on which file it fails.
>>It still sounds like right issue to me. Did you try to build under different logins?
>>
>>>
>>>When we build an exe on our mapped network drive with "recompile all files" checked we get a "File in use" error and the build fails.
>>>
>>>If I uncheck "recompile all files" the build completes with no problem.
>>>
>>>I can recompile all files individually with no error.
>>>
>>>If I copy the project to a local drive and run the build there with "recompile all files" checked, there are no problems.
>>>
>>>I have checked and rechecked all rights issues etc, a well as copying the project to another directory but it still fails.
>>>
>>>I have checked the libraries for the CR/LF missing problem.
>>>
>>>Any ideas would be appreciated.