Dropbox Install crashes admin function.

I uploaded extracted Dropbox 0.7 plugin to my site in the plugins directory as per instructions (several other plugins installed sucessfully). Once the Dropbox plug is in the directory, the Dashboard and other admin functions crash with the error message:
Fatal error: Call to undefined function _() in /home/gwirf/public_html/tshistory/plugins/Dropbox/DropboxPlugin.php on line 41
When I remove the Dropbox directory from /plugins, everything works as usual. Has anyone else had this problem? I would like to solve it asap and would appreciate any ideas. Thanks,

This looks like a bug; a typo in the DropboxPlugin.php file.

That function call _() should instead be __() (with two underscores instead of one).

We'll make the fix on our end, but if you're looking to get past this right now, just adding that underscore on line 41 of DropboxPlugin.php should get you working again.