Android App don't start

[sspssp]

Hello,

I download the Android app over the Market. After the "successful installation" I want to to start the App. But I only see a gray screen and after some time the Message that the App don't response and I can close, wait or send a status.

I use a HTC-Desiger Z with Android 2.3.3. I also try to reinstall but it don't help.

[licenced]

Did you restart your phone? That seems to help in some cases