OP here. At this point, I'd prefer not to name the clinic, because we haven't left them yet, and we don't want to have an antagonistic relationship with them as long as we're still there.
Suffice it to say that their name has not come up in this thread as a possible solution to our problem.

(We're leaning toward moving over to Shady Grove.)
Despite the fact that we're still two weeks away from Day 1 of the next cycle, the financial office at our current clinic is already telling us that we probably won't be able to go forward with the next cycle because they (the clinic) submitted the wrong type of procedure to our insurance co for pre-authorization, and golly there's just nothing they can do to un-do that. Whatever. Our insurance co doesn't even require pre-authorization, the clinic is the one that insists on pre-auth.
I think this new insurance procedure is just a way to get us to pay up front and maybe even let some of the money we pay "age" in their accounting system before refunding us after they are reimbursed by the insurance co.
Sorry for the rant. It's hard enough to deal with trying to get pregnant, but it completely SUCKS to have a clinic that seems hellbent on NOT getting you pregnant.