On some MacOS systems, the 5.2 Imatest release has an issue where the system temporarily freezes for under 60 seconds when file dialogs are opened.
We have traced this to the new 2019a MATLAB compiler runtime and are working with MathWorks to resolve the issue.
As a partial workaround, you can enable the file selection by going to options II and selecting “use the new uipickfiles dialog. Display previous batch of files”.
If you are experiencing this problem, please contact us at firstname.lastname@example.org so we can understand the scope of users affected by the issue and update you when the problem has been corrected.
Our sincere apologies for any inconvenience that this causes you.