Shortly after Apple released OS X 10.10.1 Yosemite, Dropbox began sending out emails to users confirming that the latest Mac update helped solve a rare crashing problem that was seen with apps integrated with Finder. In the note, Dropbox urges users to download the update as a result. The following was said in the email to inform users of the news:

We’re reaching out to let you know about an issue in Apple’s new OS X Yosemite that causes problems with Dropbox. You can resolve this issue by installing the latest Software Update for OS X Yosemite.

OS X Yosemite may occasionally cause some programs to crash when you open, save-as, or first save a file. These crashes are rare but happen when an application, such as Dropbox, uses Yosemite's official Finder integration — and if that program crashes because of this interaction, unsaved changes may be lost.

To fix this issue, Apple has released OS X Update 10.10.1. This update is available for free in the Mac App Store. Details on how to update your Mac are available on Apple’s support site.
For those of you who didn’t know, Apple issue OS X 10.10.1 this past Monday specifically to deal with reported Wi-Fi connectivity issues and improve Microsoft Exchange reliability in mail. The app crashing wasn’t actually identified by Apple in its release notes nor was it an area of focus for developers during the beta testing phase but nonetheless it seems to have resolved the issue. As a result, Dropbox didn’t need to make any changes on its end to remedy the situation. Apple’s fix may extend to other third-party programs which may have been experiencing similar crashing issues as well.

Source: Dropbox via AppleInsider