Scrolling e-mails in "Best Alternative" (quick look) doesn't work sometimes

Every once in a while scrolling e-mails in the Best Alternative view (Quick Look-based) seems to “lock up” (I can’t scroll up/down) anymore. This also seems to happen with Quick Look when I open the samen item in the Finder.

It doesn’t seem a DT issue, but have more people experienced this or found a fix?

  • Are they long emails?
  • Emails with attachments?
  • Emails with HTML content?