Not sure if this is the preferred method for bug reports, but I've seen a bunch in these forums, so here goes.
The manual grading buttons do not appear to be working for me for reading practice (writings, tones, and definitions are all fine.) I notice it because for new words, I like to manually set it to unknown even if I type the pinyin correctly the first time so I can get a bit of extra practice early on. When I click the 1 at the bottom of the screen, it appears to take it, but the little checkmark button on the right hand side next to the answer remains green, the pop up still says "you remembered this just fine," and after a few more reviews I click back to check, the grading button has returned to 3.
Clicking the little checkmark button and cycling through to the proper grading (rather than using the 1-2-3-4 buttons) does still work and the grade sticks, so it's not a high impact problem, but I thought I'd ask if anyone else is noticing this.
I'm using Chrome 10.0.648.6 dev on Ubuntu 11.04.