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For some reason unbeknownst to me, the DekiWiki installer doesn't set up the "attachments" directory, and the LocalSettings file doesn't talk about it at all, so if you don't look through the source files, you won't know why attachments are getting uploaded (but instead, in the "What's New" section, they'll be listed as blocked). You should be able to fix this by making a directory called "attachments" off the web root for DekiWiki, and make it writable by your system's web user (i.e. "apache", "www-data", "nobody", etc.). The web user will depend upon which operating system distribution you are using.
Note: looks like the installer does make the attachments directory now as of May 2007 bstrackany 7 Jun 2007
See Also: DekiWiki/Installation Guide (Configure Apache)