Chris, I might have another example that supports the theory that jailbreaking can break all web clips. I've got
a site that turns several web apps (mostly Google stuff) into fullscreen web clips. (It's nothing fancy, but works nicely)
I've been working with one guy to troubleshoot a similar problem - he had his iPod jailbroken, and the web clips used to work, but now they crash when he tries to launch them (just like the OP of this thread). I had him try a few other web clips from other sites (to be sure it wasn't my site), and he has the same problem with all of them.
I've asked him for more info on what tool he used to jailbreak, etc. I'll let you know when I get more details. Hope this helps!