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bobc
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uncle_bob
Going through the schematic, I'm having a tough time finding the supply and ground connections for U1 and U2. I'm going by the pdf version, so it may be a bit out of date....
Those are hidden pins which automatically connect to VCC and GND. You can toggle display of these in the schematic editor.
.... which works less well in the pdf version.. (:D
Are those two chips running off of +3.3 or +5V? I'd guess U2 is 3.3, but U1 might be something else. If so a 74HCT part might be a better thing to use.