What really physically is happening is the nozzle is being moved up in Z after the skirt and outer perimeter have been printed and then after about 3mm of print model flattens out and layers are proper. To me if the autolevel data was wrong then it would be tilted to one corner or something, where one corner of the model nozzle would be making contact with bed and the other corner way to high off of plate, but that is not what is happening. Error in Z appears to be uniform across bed.<br style="clear: both; font-family: Arial; font-size: medium;"><br style="clear: both; font-family: Arial; font-size: medium;">I am fairy convinced it has to due with EEPROM value, as this happened when I had to change out ardunio's because my Rx led was flashing and could not flash firmware to board or connect with repetier. The only EEPROM values that should effect it are Z-probe height which is set to 10.7, what is adjusted to obtain right nozzle placement above bed, and Max Z probe - bed distance set to 2mm. I had the most up to date firmware and upon swapping boards immediately flashed it, however my latest EEPROM backup was about 5 days old. Will experiment more with EPPROM values and continue to troubleshoot this evening.