When I try to extrude a Rectangle from a sketch by clicking on the direction arrow the sketch glows green and the system locks up. Have to press ESC button to get back to sketch.
In order to get your question to the right forum, what product are you using?
I suspect it's a system setting/incompatibility [usually graphics] related issue.....could you give some info on your PC spec's?
Also, what version of Solid Edge ST6 is it? [Commercial or Student Edition]
You migh try going to [in a new "Part" file] the Solid Edge Options, and under the View tab, change the Application Display to "Backing Store".....see if this gets it going.
Design Manager Streetscape Ltd
Solid Edge ST10 [MP5] Classic [x2 seats]
Windows 10 - Quadro P2000