Henrik,
Last night I experimented some more back on the development board with other pins to check this out. Turns out that all the pins for the "B" ports worked for either the clock or the data line for i2c communication. However, I also tried port C.3 on the development board as using this pin on the main board didn't work and sure enough it didn't work on the development board either. Dunno why not. It has digital I/O functionality like all the pins/ports I tested on the *B* port; the only difference that I can see between my B and C ports is that all the digital I/Os on B ports are listed as TTL whilst all the digital inputs on the C ports are listed as Schmitt Trigger.

Thanks,

Troy