In Mac OS 10.14 Beta (18A347e) and FM188.8.131.52 (Hardware Mac Pro touch 13", late 2016) the boolean operators are no longer visble.
Our Development and Testing departments are aware of this issue under macOS 10.14 Beta. Your post has been attached to the original report.
This issue has been addressed in FileMaker Pro 17.0.3 Advanced.
I've been having the same problem since I upgraded to OS 10.14.2 from 10.13 early this week.
Using Filemaker Pro Advanced 184.108.40.2060 on an iMac Late 2013.
When I reset, the operators become available. When I close the window then reopen, they are missing again. Is there something else I can do besides resetting each time I do a calculation?
Usually after I start a calculation, I expand the window since the size after resetting is too small for most of my cases.
The only workaround for FileMaker Pro 16 under macOS Mojave 10.14.x is to reset the dialog sizes and positions.
Thanks. I was afraid that would be the answer.
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