I am apparently "yet another" person who has had ED-E go missing and cannot get him back. This is so clearly a MASSIVE BUG in the game - and for quite some time now - I am surprised that you have not addressed this issue yet. Forgive me if I am wrong, perhaps this issue has been addressed and a solution exists but I have been unable to find it on your website nor via Google because the search results are FULL of people reporting very similar problems but only receiving lots of third party tricks and tips which appear to be nothing but hot air and voodoo.
I have had companions "go missing" once or twice before but they eventually catch up if I travel or do the "elevator" voodoo. This bug is clearly something else.
I am VERY angry that I have paid full price for a game that I now cannot complete due to how buggy it is. I am currently stuck outside Caesar's tent on my own but unable to enter it because ED-E is apparently "with me". He is most definitely not despite the game thinking he is. I cannot progress in this current quest and from what I've read about other people's similar ED-E related bugs, I won't be able to do other things either.
As a paying customer I demand a response from Bethesda Softworks. Will you fix this problem or have you sold me a product which fails the UK Sales of Goods Act 1979? If you will not fix this problem then I want my money back.
Yours frustratedly