I've been seeing the following two problems in pretty much every model I've worked upon:

- Sometimes I'll be trying to select an edge within a solid, and as I'm mousing over the edge trying to get it to "light up" to select it, I'll suddenly see an edge somewhere off in another part of the solid "light up", even though it's nowhere near the mouse cursor.

- At other times, especially in the ortho views, I'll be trying to select a 2d shape, and it won't ever "light up". Sometimes zooming in
more helps, but usually I'll have to go to another view to try and select it there. Usually its the only object in the vicinity of the mouse cursor, so its not like there's too many objects for it to discriminate between.

Are these known problems?