Why is ddebug_backtrace coming up blank? I've been using the Devel module for a couple of years now but every time I try to get a backtrace I run into issues.  I remember getting it working once, but I don't remember how.

It seems like using dpm(ddebug_backtrace()); should do the trick.  I have tried it with no argument, TRUE, and FALSE, and I have also tried removing the dpm function it's wrapped in.

I have dpm calls directly above and below this code that print variables appropriately, but the most I get out of dpm(ddebug_backtrace()); is a blank line in the Krumo output.

Suggestions mightily appreciated.
For me the command had to be called without the extra d

dpm(debug_backtrace());