This is by design. Unlike the previous versions the new version shows multiple compilation errors (as you type). Previous versions only showed a single error when you explicitly compiled the app.
Breakpoints and errors use similar colors. I felt that adding breakpoints to the right margin will make more harm than good.
Lets see in a month or two whether we miss these marks or not.
I share Klaus's concern.
In my opinion locating breakpoints (and bookmarks if possible) are more important than compiler warnings. A marker which tells me that a variable is not assigned a value is something I don't really need to know most of the time.
in 5.0#4 the only option dealing with breakpoints is [Edit > Remove all breakpoints]
If they aren't going to be highlit on the border then can't we at least have a way of finding the next one?