Interesting.
Already reported that issue some time ago to the developers, but with a different solution. We changed the toolbar z-index to 1 (from 3) which also worked. Unfortunately I guess it never got fixed :/
See here: https://github.com/osTicket/osTicket-1.8/issues/980
@[deleted] @[deleted]@osticket.com
Would be great to finally see this issue fixed ;)