This bug is exactly the same for me on FCP10.1.4. It crashed over 20 times today, as I tried different workarounds. Yours was the trick. The background noise removal tools are not as fine as the EQ FX, so I don’t use them much, anyway. Thank you so much for helping us out.
Dave Stucke
MacBookPro15\”-2014/16GB/256SSD/FCP 10.1.4