Though there wasn't anything particularly severe about the problems in the Dropbox 2.4.x desktop clients, the 2.6.2 version (as per the release notes) improves the speed of the UI quite a bit and offers improved setup—which you don't need if you're satisfied with your current version. You can now handily pause synching from the system tray pop-up and users are no longer unlinked from the online service if they roll back to a previous version. Of course, the only reason most users would want to roll back is a bug. So far, 2.6.2 seems relatively stable.
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