MacOSX clients: unable to send keystrokes to the client: Enter, backspace, space
MacOSX 10.13 and others: since a longer time I am unable to write anything else then a-z and 1-9. Keystrokes like ENTER, space, backspace etc. are ignored.
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Found this myself on a Mac 10.12 client today.
Also couldn't copy/paste so had to use the send clipboard to screen button to type out the URL to the Chrome address bar and use the mouse to click the URL to proceed.