Product and version: FileMaker Pro Advanced 17.0.3, 16.0.4 and 17.0.2
OS and version: MacOS 10.14.2, MacOS 10.14.1 and Windows 10 Pro. All with dutch system-settings
Hardware: MacBookPro 15.1, VW-Ware fusion 11
Description: Using a let-formula allows more or less random text to be entered and ignored. Sometime a formula is fully functional and sometime only partial. Using an operator will force FM to show an error.
I have noticed similar behaviour before with older versions too, but wasn't able to reproduce it until now.
How to replicate: See the scripts in the attached file, that shows a few examples
Workaround: enter correct formulas ...