Annoying Playback Issues

[12stepcornelius]

I just upgraded to PT 10 from LE. I've been trying to begin recording but my PT is virtually unusable due to playback issues. One of them is that when I am recording an instrument through DI, it is incredibly fuzzy and I sometimes I also hear echoey pops that resonate when I strike a note. If I mute the track it sounds fine, though when playing back after recording I get no audio, just the echoey pops. Another major problem is the error message that says, "CPU usage is holding off USB audio. Remove some plug-ins, delete some tracks, or increase the "H/W Buffer Size" in the Playback Engine dialog. (-6104)." This is the kicker that makes my PT unusable. I try increasing the buffer size but nothing. The Playback Settings I've been trying are

H/W buffer size: 64 samples
Host Processors: 4
CPU Usage Limit: 99%
Ignore Errors During Playback/Record (checked)
Plug-In Streaming Buffer: Level 2

And I'm selecting 48 KHz initially when starting a project.

Any ideas of why this is screwing up? Thanks

[loosestones]

turn off wifi, and Firewire DHCP routing. should take care of most -6k errors.

[dissensus]

i got rid of the "CPU usage is holding off USB audio" message by inserting a powered usb2 hub (belkin) between my audio interface and my usb3 equipped mac.
hope this helps.

[12stepcornelius]

Ok well my FireWire was already off I believe. I'll try turning off my wifi next.

[12stepcornelius]

Ok, so another weird thing. Just booted my pro tools project back up after turning off wifi and FireWire. No more error message as of yet, but now whenever I record something, it only plays back through my laptop speakers, not through my mbox2. What's going on now? Frustrating.