Grid - Height : Expression evaluated to an illegal value

Hello,

I have run in to an odd error.

I have a common grid. It has been placed on a pageframe class. It is used only in one form, multiple times on that form. The hierarchy: grid is on a page of a pageframe, on a container, on a page of a pageframe, on a page of a pageframe, on a form.

For some reason, when a user has configured their system to 350% DPI I get this error. "Grid - Height : Expression evaluated to an illegal value"

I've added a method "height_assign" to capture things.

So the new value is 58, the current value is 94. The parent Pageframe height is 131.

The call stack suggests it is during form instantiation, before the Form INIT. Yet this one complicated form is the only form we've seen this error on.

Does anyone have some thoughts about what to try?

Thank you, Tracy