It's only a matter of time for any one who uses a rotary cutter to have an accident. I use several safety products. One for each cutting job.
1. Rule Steady - Pricey but my favorite. Cost much less then an ER or Dr. visit.
http://www.rulesteady.com/
2 Different sizes of Gypsy Gripper.
3. Quilters Slide Lock
http://quiltersslidelock.com/
4. Accuquilt Go