Hyperlinks not opening browser

I’m using eM Client 7.2.34711.0 on Windows 10. I can’t pinpoint exactly when, but in the last few days hyperlinks stopped working when I click on them in an email. Firefox 65.0.2 is set as the default browser, but nothing happens when I click a link. It is the same behavior whether FF is open or closed when I click the link in eM. For now I’m right-clicking and selecting “copy link,” but is there anything else I can try to troubleshoot this problem?

EDIT: I wound up restarting my computer, and this time it fixed the link opening problem. The computer has been shutdown and restarted previously without success, but this time it worked.

same thing here. eMclient mail message hyperlinks did not open Firefox.
Rebooting the Windows 8.1 laptop solved the problem.