I used to have the following in my Emacs init file that would make sure that certain colors display better when using for example the tango dark theme:

(setq ansi-term-color-vector

[unspecified "#000000" "#b21818" "#18b218" "#BE5F00"

"#6D85BA" "#b218b2" "#18b2b2" "#b2b2b2"])

More generally, I had the ability to change my ansi-term colors with a command like:

(setq ansi-term-color-vector [unspecified "dim gray" "red3" "lime green" "yellow3" "DodgerBlue1" "magenta3" "cyan3" "white"])

However, when I run this with the latest stable Emacs, I get the following error in the minibuffer, and my ansi-term terminal never loads:

"error in process filter: Invalid face; unspecified"

Any thoughts?

James