Please help me with MPU9150!!!

Hello, All
I try to run MPU9150EVB with microcontoller C8051F342 of firm Silicon Laboratories.
And in the course of this fascinating work I have a growing number of questions!
Could someone answer some of them?
1. Firstly, what I2C address in the chip? The pdf specified 0x68. Chip at this address does not respond. However, it responds on address 0xD0! How it is to be understood?
2. I wrote based on examples from CA SDK procedures of initialization of accelerometers and gyroscopes, and the process of reading their outputs. The data is read, but the gyro Z always give 0. Everything else looks very plausible. Are there in the MPU9150 enable/disable bits of each gyro?
3. What is the physical I2C address of the compass. In PDF - 0x0C, in the forum someone used 0x0E, in CA SDK scaned addresses 0x0C-0x0F!!!
4. I did not manage to get a response from the compass!

Help me please for begining!!!

Regards
Oleg Nicolaiciuc