Thanks for letting us know about this. We will check it out.
And: Very nice hack you did there :thumbsup:
Edit: Ok, this happens because the original level 75 has no bonus blocks, so the list for this level is empty. When you put bonusses in this level, the game has no idea what it should drop. We have to adjust that in the editor.
At the moment the same problem will occure in level 75, 84, 96 and 98.