Fillable form checkboxes not displaying.

I have multiple fillable PDF forms created in-house using Adobe Acrobat Standard XI.  They've worked fine up until yesterday.  I had an unrelated machine issue and our IT department took my computer to install a newer version of Windows 10.

I got the computer back, load up one of the forms and the checkbox fields will not display properly.  The fields were set as "check mark" in the original document.  I've tried editing the field to another symbol and the only one that works is "cross"... which is basically an "X".  None of the other symbols display.  The properties indicate that Acrobat is using the Adobe Pi Std font for these symbols.

I COULD go through all of our dozens of forms and change the "check mark" to "cross", but this would literally take me hours of updating forms.  I'm hoping for a simpler solution that would allow me to display these other symbols again.

I would appreciate any help that anyone could offer.

Thank you!

Will