AddRelativeForce doesn't work with Bullet engine

edit

I have written a plugin communicating with ROS, which subscribes to a "wrench" topic and uses link->AddRelativeForce() to apply the force to the link.

While it works ok with the ODE engine, it doesn't seem to work with Bullet. The body simply doesn't move. link->AddForce() doesn't work either.

In contrast, link->SetForce() seems to work fine.

Am I missing something here?

I don't have a bitbucket account to submit a bug report, so here is the next best place for me.