First, is there a way to re-open topics in this forum, should be a way to continue a thread - anyway re https://forum.inaturalist.org/t/blank-observation/207
I have had this sort of problem with a few observations, usually after I have added something to the observation - just get a blank page between the head and footer sections of the page.
I have tried refreshing the page, various browsers (Firefox, MS Edge) and different computers (Windows, Linux) to ensure it wasn’t just a caching problem. If I view page source there is plenty of content there, so some sort of rendering problem.
I’ve saved a copy of the page via the browser if that’s liable to be any use.