Hello, I am new to Sketchup and am in the process of learning its features. I am on the third tutorial which focuses on designing a room. When I measure guidelines for the first wall, I have absolutely no problem. When I navigate to the adjoining wall and use the tape measure to set up guidelines, the guidelines disappear behind the wall. I can see the guidelines above and below the wall so I know that they’re there - I just can’t see them on the wall. I’ve checked the view box and have done some of the other suggestions without any luck. I’ve also emailed customer support, but I can’t get an answer. I’d appreciate any help with this problem.