I have a fm solution in fm server 14. It works fine in fm pro 14 but when someone access it via fm pro 13 then the icm of the button don't show.
The button however works normally.
Thank you for your post!
Button Icons were not introduced until FileMaker Pro 14. Features introduced in New Software will not display in older Versions of the Software. That seems to be the scenario you are seeing here.
I hope this helps!
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