Hello Tobias,
Did you take the time to look at the datasheets on each of the uP's to see what the differences are in the settings.
You do realize the pinouts are different between the two. If you only took power from the X1 and connected it to the 28 pin then what have you done with MCLR? It needs to be tied to Vdd in order for the chip to work properly. As I glanced over the datasheet (it's the same for both) I didn't see any differences in the registers with a quick scan but I could be wrong. Also the "A" version chips need a .1uF bypass capacitor as close as possible to the power pins. What are you using for an oscillator, internal or external, and if external how do you have it connected to the adaptor?
HTH,
BobK
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