I haven't heard any issue from Arc and they have many riggers using it.
I did a quick test with a cylinder, a couple joints and one control, and it appears to be working.
Thanks Sean for helping me find the bug. I wasn't looking at the blendshape node.
So the bug is when you export, the blendshape node gets disconnected.
This doesn't really hurt the functionality, other than making the file unusable as a rig after export.
This isn't an issue if you are rebuilding the rig.
This bug has been in there since I introduced groups into the Corrective tool. I'm surprised no one noticed it! Thanks Sean!
This is now fixed and will be updated in the next beta.