Currently I have no clue what's going on.
But with the next update there will definitely be a mobloquer-dbg package. I've already tested it locally.
If your problems persist, you can make a backtrace with "gdb mobloquer", followed by "run" on the gdb prompt.
EDIT 1: I guess you are on intrepid, too?
EDIT 2: At least the dependencies of the new packages have changed:
Depends: libc6 (>= 2.1.3), libgcc1 (>= 1:4.1.1), libqtcore4 (>= 4.4.3), libqtgui4 (>= 4.4.3), libstdc++6 (>= 4.1.1), moblock, blockcontrol
Depends: libc6 (>= 2.3.4), libgcc1 (>= 1:4.1.1), libqtcore4 (>= 4.4.1), libqtgui4 (>= 4.4.1), libstdc++6 (>= 4.1.1), moblock, moblock-control