Hello FallingIsLikeThis,
It sounds like you are unable to export an email from your AOL inbox page in Safari all of a sudden. I recommend troubleshooting Safari for issues with any possible 3rd party plug ins that may be installed with this article:
Safari: Unsupported third-party add-ons may cause Safari to unexpectedly quit or have performance issues
http://support.apple.com/kb/ts3230
If the issue persists, I would next try resetting Safari with this article:
Safari 6 (OS X Mountain Lion): Reset Safari
http://support.apple.com/kb/ph11914
Thank you for using Apple Support Communities.
All the very best,
Sterling