An IGP is a GPU, even if physicaly located Inside your CPU.
Both of you, the problem is the Intel IGP/GPU, to fix:

* run JCE with --probe
* Note the index of your Intel GPU, probably GPU 0
* run jce with param -g 1,2,3,4,5 (that's an example! make the list of all your GPU but the Intel one. So my example is when you have one Intel at index 0 and five AMD), there's no space around the commas in the list.
* or, use the manual config and don't set any config for the Intel GPU

The b5/b6 have great potential, and work fine on some Vega rigs and old cards. But there's that big hashrate drop issue, i know. For some config it happens always, for some, never...
I experimented, for science, the mix of the Hybrid miner for HD7000 on my RX and the result is... surprising
I got a stable and pretty high hashrate, yet maybe lower than the b6 when it works, at the cost of a few invalid shares, because the sync is not adapted to the RX memory controller.

So I plan to release a version b-x, x for eXperimental, targetted to HD7000 owner to experience the perf boost from Hybrid (which is quite solid) and to the RX owners who have the drop problem, in case it hashes better. You will have a few bad shares, but if i get feedback the performances are good, so i'll fix the shares and release it as b7.

That's on purpose, the netcode continues to run during a pause, but the devices are idle.

The b4, sure. The b5/b6, depends if you're lucky