Command Button disappears

[cavasta]

I've inserted a command button called 'menu' into my spreadsheet. When it's
activated a userform appears. I've added an accelerator to the 'menu' command
button ('n'). When I manually click on the button, everything's ok - the
userform appears. But when I press alt+n, the userform still appears but the
'menu' command button disappears. Even when the 'menu' button's invisible, I
can still activate the user form either by clicking on the button or by
pressing alt+n. I can make the menu command button reappear by clicking on
any cell in the spreadsheet.
Does anyone know what's going on?
Thanks
cavasta

 

[WHA]

I tried but could not duplicate this error. How could you click the
button when it was invisible?

 

[cavasta]

The button becomes invisible. It's as if it has become transparent, which
makes it look as if it has disappeared though it is in fact still there. Very
strange.