Nevermind. For the record, I'm having success with the VAG COM cable from E-bay seller 'chiltonsondemand' [Recommended! US-based, fast shipping, good feedback. More expensive than the Hong Kong sellers, but faster] using the latest (1.42) version of ECUFlash. The key to my eventual success was using the drivers that came with ECUFlash- not the ones supplied with the cable or the ones downloaded from the chip maker.