Googler, JohnMu, posted a thread at the Google Webmaster Help forum asking people who see issues with the new Instant Previews to report those issues there.

JohnMu spent a nice amount of time putting together a detailed FAQ on Instant Previews, which currently covers questions such as:

What is Google Instant Previews?When are Instant Preview images generated?What’s the difference between on-the-fly and crawled previews?How can I influence the text highlighted in the preview image?Which browser can I test my pages with to check for compatibility?How often are previews updated?Can I show different content in the preview?Do you support JavaScript, AJAX, CSS, frames, iframes, Flash, Silverlight, and/or Java applets for previews?How can I report broken or incorrectly rendered preview images?I use First Click Free for web search; do I have to change anything?How can I block previews from being shown?I want to block my images from being indexed, but I’m happy with them appearing on a preview image; how can I juggle the two?An Instant Preview snapshot is showing private content that I’ve removed from the webpage — what can I do?

Now, if none of these answer your questions, then go to the Google Webmaster Help forum and post there.

John said:

Forum discussion at Google Webmaster Help.