On 17/02/15 23:54, Brent Brown wrote: > Similar happened to me too some years ago, same OS change, but I seem to = recall > I was unable to even program let alone debug. From memory were no 64 bit = USB > drivers available for the ICD2 and no plan to introduce them. There are two generations of ICD2 which differ in what chip they use to han= dle the USB. Older units use a chip from cypress (don't recall exactly what= ), newer units use a PIC (think it's an 18F4550). AIUI there is a 64-bit driver for the latter but not the former. --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .