I have used the AVR Dragon for many years, with a variety of Atmel devices, and with a variety of computers and "flavors" of Windows. Just recently, I had to work on a project for a client, and I fired up my W10 laptop and connected to the target using my AVR Dragon and AVR Studio 7. After several frustrating hours of trying to trying different Dragon drivers, and trying to read and program the device (ATtiny4313), I finally discovered that I could only do a single operation (for example, read the device signature, or read the fuses) at a time. If I tried to, for example, program the part where I had selected "erase before programming", the erase would work, but the programming would fail. If I read the fuses, then tried change one, I'd get the same kind of error. The error said that an invalid device signature was read. However, if I reset the target by cycling power, I could perform the actual programming. This is a new behavior since the last time I used the AVR Dragon (about a month ago). I updated my AVR Studio 7.0.1417, but same result.
Any ideas as to what is going on?