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The "All puzzles by difficulty" statistic does not show anymore how many of the puzzles of each difficulty I completed. It did work before.

You're right, I hadn't noticed that. It must be a consequence of the new difficulty system that we've implemented; I'll look into this.

If it helps you track down the bug (which is related to rounding I'm guessing), feel free to check out my profile (http://www.puzzlepicnic.com/stats/user?connect4). None of my 2* puzzles (ones that I made) show up in the "puzzle by difficulty" tab; I'm assuming this is part of the issue.

Both issues were indeed caused by the same problem, which had to do with grouping database entries without rounding them (which worked fine before we switched to floating point difficulties, but not anymore). It's fixed now.