Glitchy

Playing around with my setup I wanted to get a nice screenshot and log of the I2C chatter including the initialization sequence.Here's the thing. Every time I got things hooked up the system stopped.Eh?I eventually narrowed it down to connecting anything to the TX pin of the micro controller it seemed to lock up.All I can think of is that the added capacitance of the lead can be causing problems?Strange.Even stranger is that it's just intermittent.Update!So I tried again with a different Arduino. When I wrote the stuff above I was using a pretty well hardened Ruggeduino. I swapping in an off-brand OSepp board and suddenly things started working.So the plot thickens.What's different between the TX output stage between the two... next time.