I am using Chrome v. 5.0.342.9 beta, running under Ubuntu Linux 8.04. On some extensions (e.g., AddThis, Sessions Manager) the options button is grayed out, making it so I can't access the options. On others (e.g., AutoCopy, Chromed Bird) the option button works fine. (Even though I can't change anything, the extensions do still work.) Does anyone have any idea why I can't access the options on some of these extensions? (I have already tried removing/reinstalling them but to no avail.

Does anyone have any idea why I can't access the options on some of these extensions?

Because they dont have any options.
Not all extensions have options and if thats the case then the options option is greyed out.
I can see how you might have gotten confused, seems silly to have it in the menu at all if its not available....there not on the extensions manage page