Hi Wren, My shape builder tool also is not working. No clipping masks, no stroke. Literally trying to combine a rectangle to a few other rectangles. I've restarted my computer and got it to work once out of about 100 tries. Nothing fancy at all. I'd rather use this tool then draw it out with the pen to ensure my die lines are consistent. Using the latest version of AI on CC - no updates available. Running macOS Sierra - 10.12.6. Thanks!
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