Hello Matt,
Can you please elaborate more on the issue by providing:
- the RadEditor configuration - you can paste/attach the whole aspx page. If a masterpage is used, attach it too.
- the browser version under which the problem occurs. If it is IE, make sure that the browser is not placed in Compatibility mode as explained in this article: How to check if the Compatibility mode is disabled.
Version Q2 2015 is old and does not officially support any of the modern browsers. Can you please perform an upgrade to 2018.2.710 to see whether the problem still persists.
After the upgrade test whether the alert will fire in the browser:
Regards,
Rumen
Progress Telerik
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