Thanks for the reply, but I don't have those options when I look at a post I've made. All I see is a solid red bar (the bar at the top that says how long ago I made the post), with no 'Report', 'Delete', 'Edit' etc options
Problem solved, thanks to a PM from ciastosz, who can't post in the mains yet.
The problem was cause by the "Compatibility view" enabled in my browser - the torn page right next to "Refresh" button. I've turned it off and now all is OK..