JTAG communication with packages in PDIP which have the CKOUT fuse enabled and running above 3.5V may be unstable if there is a long wiring from the Atmel AVR Dragon to the PDIP AVR.
High voltage programming issue, all targets: Parallel Programming and High Voltage Serial Programming might not work if the startup time is set to 0ms (SUT fuses). The problem gets worse if the CKDIV8 fuse is not set.
ATtiny84 Programming issue: Parallel Programming may fail on the ATtiny84 if both the DWEN fuse and any of the external clock fuses are enabled at the same time. A workaround is to use the Atmel STK®500 platform for Parallel Programming of this part.
ATtiny26 Programming issue: Parallel Programming on ATtiny26 is unstable with the AVR Dragon. A workaround is to use the STK500 platform for Parallel Programming of this part.
In order to set SPI frequency, AVR Dragon needs to sense target voltage. See the troubleshooting guide.
XMEGA® PDI issues: XMEGA PDI mode on AVR Dragon does NOT work for the following XMEGA devices: A3/D3 - revisions B, C, and E, or A1 (up to revision K).