Well it looks like I have shot myself in the foot. After using my STK500 through a USB to RS232 converter for the last year with no problems I just installed 4.11 over 4.10 and now I can't connect to the STK500 unless I go through a standard serial port. The lights blink on the USB 232 device but studio doesn't see it. My guess is that studio 4.11 doesnt wait long enough for a reply from the STK500 serial port as USB devices sometimes take a short while to flush the data through. I've got all the latest drivers BTW.
Has anyone else had a connection problem with studio 4.11 and USB-232 connections? I'll repeat that everything was working fine up until the second I installed 4.11 over 4.10. Ive tried reinstalling 4.10 but that doesnt help either, something must have been permanently overwritten in the windows system files. Any suggestions from the dev team?