Embedded stream won't switch to narrow display


Having trouble recently with the widget, in that it’s lost its narrow formatting. It used to fit nicely into our sidebar with a 250px width, but the formatting is all too large now, so the fonts look too big and inline media is cropped off the sides.

I’ve worked out that the class “var-narrow” isn’t being applied to the timeline’s div. If I add it manually then the stream will look properly formatted, but I’m not sure why this has started happening.

Everything else in the stream seems to be conforming - the width of the timeline itself is correct, but I’ve exhausted my options in working out the problem here. Can anyone offer any tips as to how to fix it?

Thanks in advance.