I'm having the same issue. I think my ITB has also gone to **** on the same leg. Lateral leg pain in this leg isn't new to me because I've got some issues at the pelvis. I hadn't strained the hamstring (biceps femoris tendon) before that I can recall. Did a horribly difficult RR that had about a 1km or so steep climb with gravel for 4 laps. It was a tough race, and with my field being mixed with men, I spent a lot of it solo. My legs were sore but ok until I spent 4 hrs pressing on the accelerator with terrain and traffic making cruise control a luxury I couldn't often use. My leg buckled upon exiting the car at home. Hasn't been the same since.

Massage has been helping, but I can't get worked on too close to an important ride or race, because my legs are just dead for a day or two after. It feels like my therapist is lighting my leg on fire when she works on the tendons and the belly of the hamstring. I was doing ok off the bike for a couple of weeks, but not anymore. I have been fiddling with my cleat position a little and moved my saddle forward a couple mm. I also stand out of the saddle more than I used to in order to be able to bend the knee more comfortably. Although it hurts worse on the downstroke, I am not inclined to raise my saddle like someone suggested. The leg feels better when there is less reach (been sitting up towards the nose of the saddle to climb).