For AutoCAD LT to run properly, all the input and output ports, the aclt.cfg file, and the peripheral devices attached to your computer - pointing device, video display, and plotter - must be properly initialized. If your digitizing tablets hardware settings change and need to be reinitialized for any reason (a power interruption, for instance), use REINIT to reinitialize the digitizing tablet parameters.
Some Wintab drivers require a computer shutdown-restart sequence in order to reinitialize properly. If reinitializing the digitizing tablet does not correct the problem, shut down your computer and restart it. Then verify that the Wintab driver is functional in Windows before running AutoCAD LT.