Just had an issue where an image was aligning differently within a table cell on two different pages. All the style attributes and markup seemed to be the same.
Rather than spending too much time troubleshooting it, I just explicitly set the alignment on the table cell. Did a similar fix with a font-sizing issue in CSS recently, as well.
It’s probably not a good idea to do hacks instead of troubleshooting a CSS/display bug. But sometimes it can be a good idea to do a non-hack explicit value, rather than troubleshoot. Comment if you disagree =]