Routine no longer working in Excel Module?

Hi everyone, I'm a relative newbie to VBA within Office Apps, A work collegue and I wrote a program in VB6 that enabled us to use "right Click" context menus in Excel 2003, basically when you clicked on one of the menus it ran a Sub which was held in a sheet called personal.xls which is in the XLSTART folder on the pc. For some reason it's now not working at all on my pc although it's working on several other pc's, I've opened up the sheet I'm working on in the Visual Basic Editor and the the personal.xls sheet is there along with my other workbook, I've put a breakpoint on the sub in question, gone back to the orginal sheet and fired up the context menu expecting to find the cursor stuck on the break point, but nothing happens. It's as if the personal.xls isn't part of the sheet, I hope I've explained this correctly. Can someone advise me as to what may be wrong?

thanks for the reply romperstomper, just tried your suggestion but alas it doesn't work still

Hi, yes I've tried restarting Excel, this problem has been going for weeks, the whole pc has been restarted many times, I've 2 pc's on my desk, both with the same software, one works the other doesn't. It's as if Excel dosn't know the personal.xls sheet is there

I've just noticed one thing a bit strange, if I just open up the file I'm using by double clicking it on the first pc, then open up Visual Basic Editor, I see the file personal.xls in the list, if I open it on the other pc (same file) and look in the visual basic editor, it isn't in the list, is this of any help?