I am practising in the course “Top 10,000 Words Part 1”, and since today (31-10-2016), when I enter Russian verbs in either their perfective or imperfective forms, the app has ceased to accept those answers as correct (whereas I am 100% sure it did accept those very same words as correct before). I now suddenly have to enter both of their forms using a very precise format (e.g. I have to enter делать/с-, entries other than this exact phrase are not accepted). Do you have any idea as to whether this can be a software problem from my part or whether the course admin could have suddenly changed the course settings or something?
I don’t think it’s a problem on your end. A lot of people are having the same or similar issues with punctuation marks such as /,-() being required suddenly, and exact entry of all forms of the answer.
See some of these other reports, that seem related.