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I found a small hack to solve it.
Deleting the content of /usr/share/haroopad/locales fixes the problem. Haroopad's interface appears and run normally.

$ sudo rm /usr/share/haroopad/locales/*
should do it if installed with the deb package

It appears something went bad with the languages .pak files.
Same issue here also with Haroopad 0.13.0
When pressing "minus" key (same as "6") to start or continue an unordered list, it automatically add "######" at the beginning of the line.

Platform: Ubuntu 14.04 64bits