/cgi-sys/defaultwebpage.cgi, but for a different reason than the FAQ says it is

[tropeoverdosedwebcomic90]

The FAQ says that when that page showed up, you have added/changed/whatever'd a domain name. I didn't. I haven't whatever'd a domain name since I first made the site, so I strongly doubt it's for that reason.

Are there any other reasons that it could come up and is there anything other than waiting and clearing my cache that can solve it?

http://tropeoverdosed.pcriot.com, by the way.

EDIT: Just noticed someone else posted something similar and got an answer while I was typing this (or at least bumped the thread while I was typing this). Mod, admin, I don't care, you can delete this if you like.

[MaestroFX1]

You can't solve it.
This is server based(server migration).

Please read for more information:
Boru Server Migration Information Thread

Try after couple of hours or so.