I have a custom subtheme based on Sky (via Footheme) that uses the Fullcalendar module 7.x-2.0-beta2. In the month view, table rows containing events have exceptionally tall cells in Chrome. Firefox and IE 8 are fine.
For testing purposes, I ran up a clean install of Drupal and Fullcalendar. The month view displays as expected in Bartik and other AdaptiveThemes (Corolla, Pixture Reloaded), but in Sky, cells are tall. (See attached screenshots).
I'm not sure if this is an issue with Fullcalendar or Sky, but I started here since the behavior is theme-specific.