Starting a thread on Windows 7 gives a blocking white rectangle; on Android, "too many requests" [View all]

Using Microsoft Edge on Windows 7 (long story, and I realise you may not care about supporting Windows 7), I get this as a page when starting a thread:



with the white box extending all the way down to cover Discussion text, Include a poll etc. input boxes, and button(s) at the bottom (I can see the left hand edge of a green one, but not the text for it).

I also tried starting a thread in DU 4 from Android/Chrome (without setting up mobile viewing preferences), and I got a "too many requests" error. I've started this thread from DU3/Edge/Windows 7.