Twinkle crashes

I installed Twinkle yesterday on my iPod Touch and it worked fine. It even worked fine this afternoon. Now it crashes as soon as I click any navigation button on the Twinkle screen. I tried rebooting the device but this did not solve the problem. All my other apps work just fine, so it's a Twinkle specific problem.

UPDATE: it appears that Twinkle crashes a couple of seconds after startup even if I don't do anything...