I have a sheet with multiple form buttons. They are placed in a hidden area. When the user chooses to unhide this area (a number of rows) the buttons, like the rows, reappear... usually.

Every so often, the all the buttons collapse into a single black line. They wind up on top of each other. If you select this line, you can re-size each "button" (they have no vertical dimension), and move them back to where they belong. A lot of work.

Why are these buttons doing this? What's the fix?

Here are the format parameters.

Obj pos - move and size with cells
Intern margin - automatic
protection - locked, locked text
scale - lock aspect ratio

Thanks

Excel 2010