I have a problem with the blue line of a selected object. When I select it, it is visible, but when I hold it or try to drag it, it disappears. It is especially annoying when setting white objects on a white background, where nothing is visible and even the guide lines do not help much.
That is caused by Real-Time Drawing and Editing (which you can turn off in Preferences > Performance or by using Cmd (Ctrl) E). I believe there is a UserVoice report about this behaviour.
it's a bit better after that because I can see at least the outline but still not that. For example, if there's a circle, you can see the outline of the circle and I need straight lines like in the picture.