I enjoy the review feature and proficiency test at the study center. However, lately, I am finding some programming bugs in the features, namely:

Case 1 - during the review, when the first question requires to answer by typing a response, the review page closes after I hit enter and the display goes back to the study center page

Case 2 - during the review, when the first question requires to answer by selecting the best answer, the display does not progress to the next question; the display only progresses to the next question when I select the same question again

Case 3 - when I view a lesson, there is a pop-up review page however, the media player object is still on top of the said page which obscures a portion of the answer(s); this problem exists along with the problem described in case 1 and case 2

Case 4 - In the Popup Chinese proficiency test have encountered this kind of question at least 3 times:

"Listen to the audio and pick the most suitable reply"

我不喜欢看电视

我希望你知道

我今天在报纸上看到的

我什么也不知道

-- problem is that there is no audio to listen to

I am using Internet Explorer 8 on a Windows 7 Professional Operating System, Dell E4310 with Intel i5 processor.