I downloaded the vertminer-0.5.3 and ran your exact command to bypass my CFG file.
3 out of 4 gpu's failed immediately and only 1 ran at single digit hashrate.
Try lowering the intensity to 11. Are you running 4 7850's on that rig? Not that it matters but what brand?
I tried running with I=8, same problem. 3 out of 4 died immediately, although not the same ones as before.
These are XFX 7850s. Im not 100% sure if they have 1G or 2G memory, ill have to wait till I get home to see the box.
This is the settings I just tried again:
"api-allow" : "W:127.0.0.1",
"api-listen": true,
"api-port" : "4028",
"auto-fan" : true,
"expiry" : "1",
"gpu-dyninterval" : "7",
"gpu-engine" : "1000",
"gpu-fan" : "0-85",
"gpu-platform" : "0",
"gpu-memclock" : "1300",
"gpu-powertune" : "0",
"gpu-threads" : "2",
"intensity" : "8",
"lookup-gap" : "2",
"no-pool-disable" : true,
"no-submit-stale" : true,
"queue" : "1",
"scan-time" : "1",
"temp-cutoff" : "85",
"temp-hysteresis" : "1",
"temp-overheat" : "80",
"temp-target" : "75",
"thread-concurrency" : "4096",
"vectors" : "1",
"worksize" : "256"