You can always ask it here, but for many feature requests the best place is Meta Stack Exchange. Physics Stack Exchange is part of a large family of sites which share the same core engine; as a pretty strong rule of thumb, if your question would be as applicable here as in, say, Gardening & Landscaping Stack Exchange, then the place to ask is the mother ...
Generally when the site starts acting up the problem is local to your browser. Trying
forcibly reloading the page
if that fails clearing your caches
There shouldn't be a connection between the ability to make comments and the ability to see them.