[Update] Bethesda has sent Shacknews the following response to the original story below: "The ED-E bug was in Fallout: New Vegas (not the Honest Hearts DLC) and affected a very small group of users. It was largely eliminated in the previous patch. While a few may still be encountering issues, we will be providing a way for them to manually force their companions to leave their party in the upcoming patch, thus eliminating the issue entirely."
[Original Story] It would appear that, like the original adventure, the latest DLC for Fallout: New Vegas shipped with a few bugs. According to one user on Bethesda's blog, the Honest Hearts DLC for New Vegas won't work with saved files that have fallen to any number of the bugs found in the main game's "ED-E, My Love" side quest.
Bethesda promises a fix is in the works; however, there is some additional bad news, the fix won't apply to all. "If you already have a save game where the bug is occurring, the fix will not apply and you'll need to revert to an earlier save prior to ED-E leaving in order to play through Honest Hearts," Bethesda's Nick Breckon wrote.
Shacknews has contacted Bethesda for an update on a fix and whether or not the PS3 version of the add-on will be tested for this error prior to seeing release.
Fallout: New Vegas was developed by Obsidian Entertainment and launched in October 2010 for the PC, Xbox 360, and PS3.