Hello Zebediah,
starting with commit https://github.com/wine-mirror/wine/commit/9271efc0c746 there's a lot of log spam in ReactOS: "RpcBindingFree returned 0x6a6" So far I couldn't reproduce the error in Wine though.
I'm attaching a proposed patch that fixes the issue. Could you please take a look on whether the attached patch would be suitable for inclusion into Wine, or whether that problem points to another underlying issue?
Regards, Fabian Maurer