This appears to be a conflict between the Yahoo! Today Beta ad that loads at the bottom of some emails and the HTC mail app. It appears to affect most HTC phones on all networks. I have observed that, when loading an email and scrolling immediately to the bottom, that there is a loading icon (gray bar with a spinning clock). Once this stops, it attemps to draw the Yahoo Today ad, and at that moment is when the email content disappears. I am 100% with the crowd that does not want to have to download a separate app for each email service. I'm not particularly a fan of K9, but until Yahoo backs down on this or they or HTC come up with a fix, I suppose we're stuck.
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