This is a little hard to explain so please bare with me.
I have just recently dug out my STK500 and have it al connected up. I have it connected via a USB to RS232 converter and powered by a Digitor power supply. The device is working without issues. However, when it is turned on and plugged in to my laptop (which is made completely of metal) touching the laptop with my arm or finger gives me a little shock. Its like it is not grounded properly or something... when I run my finger across the top of the laptop, there is a kind of resistance and you can tell there is an electrical current present.
Something else I noticed is that the Digitor power supply makes a static noise when in use. I'm not sure how I can further explain what is happening but if you require more info please let me know. Has anyone experienced anything like this or have an idea what could be causing this?