On my computer, with my Apogee Duet 2, with ASIO4All, there are small glitches (like small clicks) before the music starts when I use 64-bit mode and sometimes the very beginning of a song is eaten. It does not happen with my Focusrite Scarlett 2i4 2nd Gen nor Topping D10 used with their respective drivers (with ASIO4All i'm not sure, IIRC think it's fine too). With the Duet I tried 32-bit this morning and didn't notice any glitch.
I'm not terribly surprised. Exotic software chains like these are not necessarily very well-tested (contrary to, say, the standard Windows audio APIs), and the ASIO API specification can be somewhat ambiguous and hard to understand when it comes to things like priming (i.e. starting the stream), making incompatibilities between applications and drivers more likely.
If you're experiencing glitches with ASIO4ALL I would suggest filing a bug report against them, but note that this could also be a bug in the foobar ASIO plugin. The fact that this is happening in 64-bit and not in 32-bit is probably due to some coincidence (possibly undefined behavior creeping up in different ways) and is not necessarily an interesting observation in and of itself.
You can also try FlexASIO if ASIO4ALL is not working well for you. Full disclosure: I wrote that driver.
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