I'm experiencing constant crashes with 1800 and 1801.
Having opened either a new regular window or an incognito window, when closed and returning to the single, main browser, it crashes. Of course when I launch M6 again it then has Maxthon Now with the reopen crashed closed tabs ... which opens in a new window. So I open that, then close the Maxthon Now window, and it crashes again!
I had installed over the top of 1700; will now uninstall and try it fresh...