Today I installed the latest version of Sketchup Pro 2015 (Windows 7), and in a model i wanted to delete some lines. I selected the lines, pressed delete on my keyboard. However, nothing disappeared, while it should. I could not get the selection deselected, so the lines stayed visible and highlighted in blue.
The only option is to select all (ctrl+A) and then deselect all (ctrl+T). Then the lines are deselected, and thereby no longer visible (neither in blue, nor in black).
Seems like a bug to me, never had it before and I’m not doing anything wrong as far as I know.