I had the same thing happen 10 minutes ago. While working on a project I double clicked on an Sprite with the Pinned behavior. The program became unresponsive. I tried to end the process and the Task Manager became unresponsive as well. I had to restart the computer. Well it turns out that Construct2.exe became corrupted as well as my current project and what appears to be some of the assets in the folder with it.
The computer I am using is relatively new (Laptop, AMD Phenom II X4 N970 with 4GB DDR3 Ram, 64-bit Win7) (32-bit edition of Construct2), so that doesn't seem to be the problem. I do have to note that, I am running Construct 2 off of a flash drive and also have my project and assets on it as well. It is possible that the corruption occurred from shutting off the machine, although the drive wasn't saving at the time.