I have the same problem. I unclicked the 'auto-hide task bar' and the task bar is fine. However, when i unplug the power point and let it run or battery or when the laptop reboots (still on battery mode), the damn settings keeps going back to 'auto-hide task bar'.
It's getting to a point where everytime i reboot on battery or unplug power point to let laptop run on battery, my settings resets.
This also applies to the background of my desk top. If the laptop runs on power plug, it's fine, as soon as i leave it on battery mode, both my task-bar and desktop background resets to factory settings.