I believe I've figured out the cause of my recent bout of TE. I changed my forehand grip this past spring to try and get more topspin: I had moved my thumb to the second bevel (considering the top bevel as the first), trying to push my grip around to the right (I am right-handed) toward a Western grip. Unfortunately, this meant I was essentially gripping the racquet by pinching between the upper pad of my thumb and my index finger. Also unfortunately, it meant there was a lot of air or space in my grip--I wasn't truly gripping the racquet very fully, just pinching like a pencil grip. Also, my other three fingers weren't doing very much because they were not fully gripping the racquet. The bottom line was that I was trying to hit forehands with about 1 1/2 fingers doing all the work. This forced me to squeeze my grip really hard. Last night hitting with my hitting partner I tried wrapping my thumb all the way around in more of a fist-like grip, barely touching my middle finger. Everything suddenly felt much more solid. And the grip-hand interface seemd much more secure and tighter. Where do you put your thumb on your forehand grip?