Mapping Issues with VCI-100 and two MidiFighters

Hello all-

I couldn't seem to find any info on any similar situations in the community , so my apologies in advance if this ends up being a redundant thread.

I am having huge issues with mapping my VCI-100 with my two MidiFighters. I am using one MidiFighter to trigger cues 1-8 on the A & B decks, and the second is using the Instant Gratification mapping.

This setup was working flawlessly last evening . I imported the I.G. mapping twice with the big import button, then added the VCI-100 mapping, and then finally manually mapped the other MidiFighter to handle the cue points. I worked on my new set for a little while, and all was great. Then I started up my system today to find that everything had gone to hell. The MidiFighter handling my cue points doesn't work anymore...the lights light up, but no cues trigger, even after changing the in and out ports. The I.G. MidiFighter and VCI-100 still work, but are VERY laggy and unresponsive; the effects from the I.G. MidiFighter often get stuck and repeat endlessly until I quit Traktor. Here's how I have things set up:

- VCI-100: Channel 1, set in and out ports to Vestax VCI-100
- MidiFighter #1 (Cue Points): Channel 2, set in and out to All Ports
- MidiFighter #2 (Instant Gratification): Channel 3, set in and out to All Ports

This is on a 2010 MacBook running Traktor Pro 2. I of course have restarted both Traktor and the computer itself, to no avail. All 3 units are connected to the same USB hub.

I'm sure this is simply user error and that I've set something up wrong; I'm hoping that maybe someone here can spot something wrong that I can't. I'm just baffled and frustrated that the setup that I had working great last evening is now utterly screwed up. Thanks for any help you can offer!