Hashcat 3.00 will not quit

Hi,

I made a crack rig with 3x ASUS 1070 and I stuck a 1070 in my main computer to play with.  Main system with 1 card runs win7 home prem, crack rig runs win 7 pro.  On my crack rig with 3x  1070, Hashcat seems to run fine until you want to quit.  I press Q and the cursor increments down one line but the prompt does not come back.  The session does quit and card useages go back to 0 in afterburner, but the command window is hung.  I can click the X to close the window, and it does close after 10 seconds or so.

On my main system with 1 card there is no issues with hashcat.  I get sustained WPA rates of 250 kh/s with no tuning.
All 3 cards in the crack rig get same rates and I see sustained WPA rates of 820ish Kh/s but when you try to quit it barfs.  I have attached an image showing several empty lines from pressing Q sveral times.  Notice the plots drop off but the prompt never comes back. 

Any input on the issue would be appreciated, also I would appreciate opinions on the crack rig hardware.  Hopefully I did not skimp too much on CPU.  Thank you

Crack rig with 3x 1070 on USB powered risers:
EVGA 1000 watt PSU
Win 7 pro
mobo: asrock H97 anniversary
CPU: Pentium G3258 3.2G
Memory: 8GB
monitor is connected to on-board HD graphics and the 3 1070s have no cables connected to them.

Main system with 1 1070:
Win 7 home prem
1000 watt EVGA PSU
mobo: EVGA x58 SLI from 2009
CPU: i7 990x 1st Gen
Memory 12 GB
1 1070


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