Same issue here, T520 with Win10 - I'm running the latest build of ThinState (2.2.9) and cannot capture the image. Has anyone gotten any further with HP on this? It's a major problem for us. Our goal was to purchase a Win10 T520 and make a "golden image" that has all the necessary tweaks in it (short of the remote endpoint) and then we ship out USB sticks with the image on there for clients to self-provision thin clients but now we can't capture.
Note: I was able to capture ONCE after I re-flashed back to a stock HP image but that's it.