Have you checked these first?
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Help us help you: include your environment details. We've made this easy for you. Use the Copy System Info button in Admin Panel › osAwesome › Diagnostics, then paste below.
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Hi, I think it’s a (new) bug that no options menu is visible when trying to open it at messages sent by a client? You cannot edit a client's message anymore (or open task / ticket from that message). But It’s still possible to do so at messages / notes sent by agents.

We often edited messages that where sent by a client because they, for instance, sent a whole mail history about x pages, but only the first sentence was relevant…
Yikes!
I figured out how to fix this. Doing so will probably break something else. I will figure out exactly what is going on for the next release. But for now to get the drop-down menu back, open /osta/css/staff-desktop.css and remove overflow: hidden; from line 1196 so it looks like this:
.thread-entry.message .header {
background: #ffddba;
}