ActiveX Size and Font problem

[KG Old Wolf]

One ActiveX worksheet control changes size without apparent cause. It is the same workbook but different people have different experiences.

• It works for some people on W7 / XP but not others on W7 / XP
• It works on different monitors with different resolutions but not on some PCs with the exact same monitor and settings
• It works on machines that have different "References" and fails on those that the are exactly the same (VBA code page -> Tool -> References )
• It works on my 64 bit machine and some 32 bit but not others
• We are all on Excel 2010, same version, same patch level
• There are no add-ins in use

When it malfunctions, it is consistent - the right edge extends over another ListBox otherwise it looks just like it should.

I explicitly defined the Height, Width, Top and Left dimensions in the "Worksheet Open Event" and that resulted in the correct boundaries BUT caused the font to shrink! I've seen a number of posts with similar issues but not any solutions.

I doubt it is the code (which I could post but it is lengthy).

Any ideas? I'm baffled.

Thanks