Thanks, it was just a long shot as no one can see a reason for the issues.They have also suggested a complete examination of the Mac.

Hi I have a small production simulation program written in VB6. I have been planning to update it and make it available on Mac. To prepare I have been testing small Jabaco programs and compiling in Jar, exporting to the Mac (macbook air) and testing how they look and work. Simple things like timers, form layouts colours, button etc. There has been a coincidence of having to completely reinstall the operating system on the Mac. This has happened five times and Apple cannot find any reason for thi...

Thank you for the response but I found a big logic error MINE. It is fixed now.