Resized Thumbs are ugly, Logo an Thumb for Galleries works not all the time

Hello

When i look a gallery the first thime it works great, but only the first time. all the other times i have ugly artefacts.

The logo and the thumbs for galleries with only folders inside (nopic.png) worked once, exactly one time.

Why?

http://pics.twipnet.ch

Thx, Yvo


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