After installation of 4.5.3 with uninstallation of 4.1, every note of any patch causes crackles from USB Audio of TI Snow on Windows 7 SP1 32 bit regardless of DAWs or Audio I/Fs. The USB Audio became utterly unusable after the upgrade. Output of Left/Phone is fine. USB cable is connected directly to PC without hub. Downgrade to 4.1 doesn't resolve the situation. VC constantly claims that buffer size is strange, although the size is 256 smps on ASIO4ALL for on-board PC audio chip or 128/256/512 smps on ASIO Driver of M-Audio Ultra 8R. My PC is i5-760 with 4G RAM. My DAW is FL10. But the same symtom can be seen with Standalone VSTi Host of Steinberg.
This symptom doesn`t occur between the same TI Snow and my note PC of Windows XP SP3. No cracles between the TI Snow of OS 4.5 and my Win XP note.
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Update:
After install Windows 7 SP1 from scratch, the crackles have gone away.