It took me almost 5 days to fix the dabr problem on my vps.
At first, I thought it broke because I changed the permission setting the day before to enable the direct message function. So I spent quite some time fiddling with the app setting on Twitter side, in vain.
Then I suspected there was something wrong with the Dabr code. By downloading and installing newest code, it still didn’t work.
I did many Google search, of course. But I didn’t find any result until I found this: http://code.google.com/p/dabr/issues/detail?id=348
The reason is due to the deprecation of an old version api service. After I applied the new user.php file, it worked again!