>I am using MSCAL Calendar 7 Active X control. I wish to have Monday showing as the first column. I have set FirstDay to 2 - but Monday shows as 2nd column rather than the first in my development environment. When I build the exe and deploy it to clients it displays correctly with Monday as the first column. But it still shows as the second column on my development PC when I run the compiled exe. All PCs (my development and clients) are running XP.
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>It appears the fault lies with my development environment PC. Has anyone encountered this and how do I correct it?

This ActiveX respects your regional settings as set in the control panel. Just for kicks, try setting your location to somewhere this side of the Channel.