Has anybody had the update function vanish after a change? I changed one dimension, then exited the sketch, the part turned red, and then I looked for the little blueish update whirlwind thingy symbol in my bottom left corner of the bottom toolbar, and it was gone! I also looked in the pull down menu under edit, where is usually sits, and it was grayed out, and ctrl U also did not work. Does this sound familiar to anybody? Have you found out what to do next?