I'm sure you've read this from the Runbox website:
Quote:
If you have problems logging in
If you are experiencing problems logging in, please make sure that your browser has the latest version of the login screen. You can do this by pressing Ctrl + F5 on Windows and Cmd + R on macOS. If this doesn’t help, please try to clear your browser’s cache and restart it. If this doesn’t help or if you are unsure how to accomplish this, please contact Runbox Support.
There are a few other wrinkles on the new web servers that we are currently ironing out, and besides a more powerful and reliable webmail service we have also deployed a new spam filter.
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In general, login problems are often caused by cached information. Clear your cookies and cache, close the browser, reopen the browser, try again. IMHO your best bet is to use Chrome, because that tends to be the world's most supported browser since it is by far the most popular.