Re:UAD2+Focusrite Saffire Pro 40+Windows7 x32+Sonar X1
I have a Saffire Pro 40. Are you using the "legacy" firewire driver in Win 7. On the Saffire Pro 40 downloads the driver for Win 7 says to use the legacy firewire driver. An incorrect driver can cause dropouts (along with the firewire chip). They have instructions on how to set the legacy driver.
Having said that, I'm using the default Win 7 driver for my T.I. firewire chipset port and not having any problems. I was using the legacy driver but Focusrite sent me a Beta driver, to test for a different problem, a while back that didn't require that. I've since upgraded to the current driver but forgot to reset back to legacy and it's working OK.
Franklin D-10 Pedal Steel Guitar (primary instrument). Dobro, Tele, Gretsch Chet Atkins, 4 and 5 string basses, etc.
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