since this happened after updating to pr1.2, i consider this a bug of the update:

the offscreen blackboard lite app suddenly has an EXTREME lag on it.
on 1.1, it was perfectly smooth, you would draw as you pulled the stylus over the screen. now its lagging so strong, you can draw perfectly straight lines just by drawing fast.
also, the eraser-tool leaves obvious traces behind. its so freakin ugly.