Yes I updated the library to only one library for Arduino Mega and Arduino Uno, I use enviroment variable to select the correct header file.
...My guess, that this display from "mcufriend" lacks some filtering capacitors on power lines from arduino board, hence artifacts like those lines on half of display and unstable detection on some copies. My display shows such lines, when I power 'duinos from exrternal battery or power supply, but works without artifacts from USB. I'll try to add some later and see if it changes something.Note: disconnecting touch panel does not affect those white lines, although touch panel uses some data pins from duino - tried that.Also there is free unpopulated connector labeled CON1 but without pinout markings. It turns out it is only 3.3v tolerant pinout and here I give You what I found out using multimeter (GND and 3.3V pins You can find easily with multimeter)...Onboard 3.3v stabilizer U1 is only for SD card LCDHope this helps someone.
This is the final version, I have refurbished the example sketches, and now work fine with Arduino UNO and Arduino MEGA, including the SD card reader.
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