Motorola Defy Gallery app is crashing upon start

I have for a couple weeks a Motorola Defy with Android 2.1 (Eclair), since today the **Gallery app crashes upon start**, the screen is shown for a less than a second and then it dies. The only odd thing I did was adding a ".nomedia" file to directories where I store music so that the disc covers would not show up on the Gallery app. How can I fix that? Can I reset just that app? Thanks