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I raised a bug quite some time ago that sounds similar. The Omni people investigated a bit (since I was able to give them a sample from when the problem occurred) and it turned out to be caused when a site uses embedded/custom fonts. Apparently something in the ad-blocking code gets upset by the way custom fonts are loaded from the CSS.

The person from Omni who got back to me when I raised the bug said (I'm paraphrasing) that it was on their list, but they have so little time to work on OmniWeb that it was unlikely to be fixed any time soon. The only workaround I had come up with was to exclude ad-blocking for those sites.

In the end I'm afraid I switched to Safari (with SafariStand, ClickToPlugin, Glims etc.) and no longer use OmniWeb on a regular basis.

Hope this helps!