OK, so I got it working...turns out I needed 64-bit JRE and 64-bit REW as UAD Thunderbolt driver is 64-bit only, hence why Reaper worked...trouble is measurements are a bit unstable (couple of minor wobbles in distortion on a loopback if they finish), and I keep getting this message: Resync Request from driver (even if the measurement finishes)...any thoughts?