We are on OST v1.15.7, just upgraded from v1.15.4 as of yesterday.
If a reply to an open ticket is edited in any way - backspacing, deleting, etc. - the page freezes and becomes completely unresponsive. The tab or page must be closed, and OSTicket must be reopened in a new page or tab to restore function.
This was happening in 1.15.4 before the update, and it continues to occur in 1.15.7 after update.
Behavior occurs in Edge Version 101.0.1210.47 (Official build) (64-bit) and in Chrome Version 101.0.4951.67 (Official Build) (64-bit).
Behavior does NOT occur in Firefox Version 100.0.1 (64-bit).