Expanding the list of comments doesn't work

Question

This morning I tried expanding the list of comments of an answer, but it doesn't work.
I tried also on Stack Overflow, on How to quickly theme a view? and I was able to expand the list of the comments for that question. It seems it is a issue on EL&U.

EL&U and SO report to be using different revisions of the software; while Stack Overflow uses the 2011.4.4.1 revision, EL&U uses revision 2011.4.4.4.
Still, when I tried on programmers.SE (e.g. on What should a developer know before building a public web site?), I was able to expand the list of comments. It seems the problem is specific to EL&U.

I am using Firefox 4.

Answer 1

Now fixed, see

Add comment, flag, delete links are broken

for details.

Answer 2

It looks like the bug happens when you link to an answer, i.e. the end of the URL contains a # followed by an answer ID. If you delete the # sign and everything after it, then expanding comments works.

I don't remember seeing this before, so it definitely seems like a new bug.

(I'm still on Firefox 3.6.16, FWIW.)