Kaine, you can't log in at all, i.e. you get stuck at the connecting screen, or just after you log in you get stuck at 'Success!"?
I also use WA shaped but through a proxy, and the latencies have been all over the place for the last 10 days or so (since SEACOM, I guess). I switched to my unshaped WA account and the latencies where stable and lower, where in the past, using the shaped or unshaped via a proxy didn't make such a big difference.
I'm guessing that the 'unshaped'=ness of WA shaped for WoW has been 'switched-off' while we all pony up for SEACOM's backup service, hence the difference now between the unshaped and shaped accounts. My un-technicall thoughts on the problem.
Lastly, have you ever used or tried a proxy service? I have had the same problem where I found that since I used a proxy service (Lowerping, in this case) I can no longer connect to WoW without it using a SAIX based account, but can using an IS based account.
Hope you get it sorted.
Gus