...before I added the AD8, I never had any rf issues of any kind regardless of position. The AD8 addition may be a coincidence, but I don't know of anything else that has changed.
Please forgive me if what I'm about to ask strikes you as being overly obvious, ...it's just that I must admit to quite a few occasions (over the last forty or so years) when overlooking the obvious has had me "chasing my own tail"...
Are you absolutely certain that your AD8 is powered ? No fractured or blown fuses ?
I'm considering buying a Shure GLX-D to try out.
I'm sure you'll try before you buy, so I'd really value your observations when you've had a chance to compare these two competing 2.4GHz digital systems.
Speaking of 2.4GHz digital, some readers may not be aware that the simultaneous inter-operation of such systems from different manufacturers (within a given venue) is very likely to induce catastrophic RF-induced failures in both (or all) of them.
So, unc417, should you end up preferring the GLX-D, you'll most likely need to replace your entire wireless inventory.