The New Auction House is here with 8.3, and with it, some issues. Recently, players have been reporting that they have not been receiving their money from sold auctions. Blizzard has stated that they are aware of the issue and is working on resolving it.
Until it is patched however, you should be cautious posting large amounts of auctions. If you want to read more, there is link to the forum thread here.
To read the latest guides, news, and features you can visit our World of Warcraft Game Page.