This is an AOL issue.
This behavior may occur when AOL's graphic compression option is turned on.
When this option is on, the images are saved as the .art file type.
Connect to the Internet through AOL, and then visit the following AOL Web
site:
www.aol.com. Click My AOL. On the Settings menu, click Preferences.
In the Preferences dialog box, click Internet Options (WWW).
In the Internet Options dialog box, click to clear the Always Compress
Graphics dialog box. Click to select the Never Compress Graphics dialog box.
Click Apply, and then click OK.
For AOL 9:
1) Click on settings on the tool bar
2) Click the "A-Z tab"
3) Click "G-M"
4) Scoll down and click "internet (web) options
5) Click AOL browser tab (on the internet browser windows of AOL 9.0)
6) Click on the "never compress graphics button"
7) Save and restart computer
