Currently trying out the new beta of Zimbra Desktop 7 and running into an odd bug. The server is still at 6.0.8_GA_2678.
Each, random prior events booked in resource calendars appear to be expanding from their original starting to up to an arbitary time of the current day. Every day it is some other resource calendar event that is doing it.
It only shows up like this in the & beta 1 client. In the 6.0.8 web client and external calendar programs such as iCal & outlook the booked time shows up properly
Here's an example screenshot taken on Feb 18th: http://i.imgur.com/jeLBR.png