I came up with a work-around, drawing the line elsewhere on the photo and then moving it into the position I wanted. I was trying to draw lines fairly close together and some that crossed over each other - I was trying to show a rough design for a railing put onto a photograph of a wall. Then I got a string of the cocoa error 133020 syncing thing on the ipad and had to default to getting the images onto my mac via photostream. I really like skitch most of the time, but it can be frustrating. And I'd really like to be able to set my own defaults. The default line width is too fat for what I want to do.
Yes, this problem is driving me crazy, crazy enough to ditch Skitch altogether and look for another app (along with not being able to set my own defaults, so have to reset colour and line size every damn time). I am trying to draw lines that cross each other and I just can't do it, each time it switches to the move tool instead. Why can't it stay in the pen tool until I tell it I'm done with that, and want to switch to the move tool?