Two issues: Latency and pops

Hi, I've been using Garage Band for almost two years now and I haven't had problems quite like this before. (And of course, I am supposed to have this song done by tomorrow!)
Latency: Whenever I've had latency before, I'd be able to fix it through adjusting Ducking or changing the settings option to "minimal delay". I've done both of those things today, but I still get a lot of lag - the most I've ever experience; the input can be delayed by over a full second! It seems to get worse and worse as I play, too. This just happened today and never before. I quit all other apps, unplugged everything but my midi interface and speakers, rebooted, and it's still happening. Any suggestions?
Popping and White noise: Here's another problem that just happened today. When I play, I get a lot of popping sounds, as if my guitar cable is crapping out. I've gone through three guitar cables, two of which are only months old and one of which never pops when I'm playing through an amp. I'm getting varying levels of white noise too. I usually only get that when I have the gain set to 8 or above, depending on other setting, but I'm getting it all the time now! Any suggestions on these?
MacBook (Tiger)
M-Audio USB FastTrack MIDI interface
CreAtive studio monitors (I've tried switching from the interface to built in audio output, but I get the same results)
Using Real Instruments, not Software
Message was edited by: fakeXsound

I have had terrible pops suddenly and it turned out, that some Airport update must be the source of that. When using GB these days I just disable airport and the pops and crackles are gone.
It might be worth a try
Thomas

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