Xbian - SW Corruption issues

[Amean1]

I am a newbie and recently acquired Raspberry Pi 2.0 - Model B (512MB) device. I have loaded xbian 1.0 Alpha 5 code and using Navi 3.7.5. It was working fairly well and had originally experienced few system freezing / hang etc. So when I saw Navi updated to 3.7.7. I went ahead and updated hoping that this might solve freezing problem. However, after reboot all I see is xbian logo with loading bar moving extremly slowly, and after 10 minutes later and no change I rebooted again and samething. I believe that code load was corrupted so I reloaded the SW all over again and decided to stick with 3.7.5. But now when I power the system off completely and later power it back on, I see that system just gets stuck on xbian logo and only way to make it work is t load SW from scratch again. Since this is happening very consistently, I also replaced the SD card just to be sure but still same issue. I would truly appreciate any help you can provide to help solve this issue