Earlier Andy made a remark on the main page: why doesn't $$Bm11 make black's first move be #11 in this diagram? (this refers to the "continuation" diagram). Then I forced the regeneration of this diagram and viola, the first move became #11. Subsequently I deleted that remark. I don't know why #11 failed to show in the first place.

I forced regeneration of the diagram by making an arbitrary change to it and saving it, and then editing it again to undo the change and saving it again. There is an effect on the diagram after each save, but it did not appear in the diffs as consecutive edits are treated by the wiki as one single edit.

For those interested, I know that the string of characters representing a diagram is mapped to a MD5 hash. So internally, the wiki manages diagrams using these MD5 hashes as some kind of identifiers. More specifically, the wiki generates a diagram if no diagram exists with its corresponding MD5 hash, and deletes a diagram when it determines that no page refers to it.