Sometimes bugs are introduced with EnGuard webmail updates. When a fix is applied with a new update, your browser will have the old code stored in its cache and needs to be cleared out in order to download the new code to resolve an issue you were experiencing.
This tutorial will show you how to clear cache for Safari in macOS.
Step 1: Go into the Safari menu, select Clear History...
Step 2: Select all history from the dropdown
Click Clear History
Step 3: Quit Safari and reopen it.
Navigate to our webmail and it will now download all the new code and fixes into your browser cache.