Apple released macOS 10.13 High Sierra on September 25, 2017 and changed the way macOS reports Language & Region preferences to MATLAB. When you update to macOS High Sierra, we recommend you upgrade to MATLAB R2017b, which can be downloaded here.
If you cannot update MATLAB to R2017b, then please follow the instructions below to see if you are affected and how to resolve the issue.
No: see the following Bug Report for a workaround: https://www.mathworks.com/support/bugreports/1621180.
Yes: you are experiencing an unknown issue. Please contact support.
Does this affect the MCR / MCR based executables and libraries too?