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Wow, thanks very much. I did try, and it seems to work flawlessly. It makes editing the markdown already more pleasant, even without the preview being colored. Thanks again!

I'm not sure about the meaning of the Distributed column, but this does indeed look suspicious. If you have that option, I'd stop and start IRIS (which should clear existing licenses), and try the web terminal again. If it now works, you have at least found the cause.

As to a more permanent solution, I don't know. I don't use web terminal all that often, but I would hope that, when you log in, it adds a connection to a license that login may already have. Perhaps the web socket connection plays a part in this. Like I said, I haven't really investigated this; I just mentioned it so you'd have something to check.

You can check whether you still have licenses available in the management portal: System Operation -> License Usage. If Current License Units Used equals License Units Authorized, web terminal can't allocate a new license, which it does seem to need. If not, yours is a different problem.

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