almost ten days have passed since writing letters in support of the answer and solution to the problem is not so far. I'll try to duplicate your question stesu. After the update appeared fatal error after trying a selection of additional exercises, the phone freezes, then the program closes. Before the update it was not like that.
The device with Android 2.3.6
The second question is, when can we expect a Russification of the application? I'm more than a year using Your program and hear only promises.