Here is the message communicated when the serial monitor is opened from the IDE after loading the updated firmware:
The "Steps/unit" seems a bit excessive for the "Z" axis - although I don't know how to change it.
The only Wilson II firmware I was able to compile without error was one named "RCBugFix-mjrice". My Arduino IDE was 1.8.0 which worked quite well. Based on comments found on this forum, I reverted the IDE back to 1.6.9, loaded the Marlin code from the above named release, compiled it, then uploaded to the Wilson II -- no errors.... HOWEVER, the LCD just displayed two lines of BLOCKs... similar to issues others on this forum have experienced after reloading firmware. Fortunately, I have a copy of the firmware Marty sent with the printer when I purchased it. I was able to successfully reload that firmware (Marlin 1.0.2) and got the printer back to its state before trying to upload the more current firmware. UNFORTUNATELY, with a "fresh" firmware load, the printer still won't do an AUTO HOME. It is acting exactly has it did before the firmware reload. Here is the message communicated when the serial monitor is opened from the IDE after loading the original firmware:
(Note that the "Steps/unit" value for the Z-axis with the original firmware reload is now 390!! -- The two errors displayed were resolved by changing the TEMP_SENSOR_0 value to 5 from 1 in the configuration.h file.)
All this boils down to is that the problem has to be mechanical... any suggestions on where to start looking ... ???
POST SUBMISSION EDITS:
1) Issuing a M501 gcode with pronterface returns the following offset values stored in EEPROM: M206 X-100.00 Y-105.00 Z-11.50 (these seem accurate and reasonable)