Mini Pro 5V Serial Not Working

Development Boards Arduino
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I have a mini pro 5v this hooked up to an ID-20 for an RFID project but it doesn’t seem to be receiving data correctly. The sketch uploads correctly and everything looks fine until I scan a card and then nothing happens. I prototyped everything out on a breadboard UNO and it works fine. But when I hook everything up to the mini it doesn’t work. The status LED lights up to show it is ready, but it doesn’t appear that the mini is receiving serial data from the ID-20. The setup works with the uno so im sure the ID20 is working correctly. Wondering if there is anything I need to do for the mini to receive serial data different than the uno.

I have the serial out from the ID20 going to the RX1 on the mini. Ive even tried hooking the FTDI programming board up and running serial monitor but nothing comes through.

I am following this build: http://www.instructables.com/id/Arduino-RFID-Door-Lock/

Is there anyway to test the serial pin (RX) ?

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RESOLVED - Not sure what the issue was, but I re-copied the code and uploaded it to the mini and it worked like a charm. Really odd as the same code that wasn’t working on the mini worked fine on the uno.

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I know some code just doesnt work out the same way between platforms sometimes, lol… my micro does several things noticeably different (execution-wise) than the same sketch loading on a mega or uno.

processing rates? or memory speeds/ bus volatility?