I noticed that a review on the App Store indicated that the user was unsuccessful running DianHua Dictionary on 2.0.2. After some testing tonight, I can't find any problem specifically with 2.0.2. I use an iPod touch for development and use AdHoc distribution to further test on my own phone. Both are now running 2.0.2 without issue.
Having said that, I did also get a support report today from a user who is unable to start DianHua Dictionary. I'm inquiring further about firmware version, but if anyone else has seen any problems, please let me know.
Update 08-26-2008: The user who contacted me was able to get DianHua Dictionary to work be performing a full restore of his iPhone. If you decide to take this approach, please remember to backup important data off of your device.