I'm somewhat mystified actually, since I'm having difficulty replicating any of these issues (even while logged-in under your account). Just to add details:

1. The points system seems to be working. Javascript handles the real-time adding, so if there is a javascript problem that could cause problems. What browser are you using? Do you get any strange error messages?

2. Could not replicate this. The only time things should get "relatively" predictable is when there simply isn't much in the vocab list. But even then it should be randomized. Are you just hitting "Review" in the study center or loading a specific vocab list from your wordlist? Lesson materials also seem to be loading randomly for me....

3. If you see blank answers this should definitely not be happening. Can you forward me the details on the question or word tested along with question type -- multiple-choice english, multiple-choice pinyin, etc.. I'll take a look into this now, but if it is a bug it will probably be easier to hunt down with details.