Cannot reply to ticket

i have a situation where when I click "Reply" "Reply to All" or "Forward" on certain tickets, it doesn't open the editor and start a reply.

What happens is that is "shrinks" the current message I am looking at (in the same fashion as what happens when you click near the top of a message to shrink/expand) and the blue line zips across the top like it's "thinking" and then....nothing.

At first I thought it was related to age of ticket, or the number of replies (with 50 being the tipping point) but this is not the case. It's seeming random.

Anyone else having this problem?

Running Windows 7 and using Firefox 63.0.1 64-bit

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