RoboRio Losing WPILib Preferences

[kylelanman]

Team 2481 is trying to use the Preferences class in WPILib this year to store persisted settings rather than using our own similar solution from previous years. The smart dashboard widget is primarily what made it appealing. We are storing things like encoder offsets and PID values for our closed loop controllers.

Modifying code and redeploying works as we would expect. The settings we put into the preferences are persisted to flash and they load back up when we relaunch our program. For what it is worth we are calling save when we change settings.

When the robot is rebooted or power cycled it is hit or miss whether or not our settings get completely blown away or if they load up. About 1 in 3 reboots we loose our settings. The settings all still show up in the SmartDashboard but in order for the robot to actually use them we have to change them slightly then change them back to the actual value that should have been persisted.

Has anyone else experienced similar results or is this problem unique to us.

Thanks in Advance!!

Kyle