Version 1.0.5 of the IDE. RobotControl::motorsWritePct() has an arithmetic error when computing the left/right motor speed.

Both the left/right values need to be divided by 100.

Old code:

 int16_t speedLeft=255*speedLeftPct;
 int16_t speedRight=255*speedRightPct;

I believe it should read:

 int16_t speedLeft=255*speedLeftPct / 100;
 int16_t speedRight=255*speedRightPct / 100;