Line will not create on sketch?

Every time I try to add the first line to this sketch, the image "folds up" or disappears. THis is VERY frustrating! I have tried selecting each plane and still the same result each time. I select SKETCH, then CREATE SKETCH, then I select a plane and poof ... gone!

JON-A-TRON11 days ago

If I understand your problem, it sounds like you might be selecting a plane to sketch in that you weren't expecting. When you Create Sketch then select a plane, the view will automatically orbit to be perpendicular to the plane you selected. You can still orbit when you're creating a sketch to see where the plane is in relation to everything else.

It could also be that Sketches are hidden (lightbulb is grey) in the Browser on the left.

It's hard to understand exactly what's going on based on your text. You can use Screencast to quickly and easily record what you're doing, then share a link if you still need help: