Have the rules changed on me?  The following is a sentence from a

native speaker of American English who is on a graduate fellowship

or visiting professorship—I forget which—with a Flemish university.

(I had considered myself an expert in punctuation until now).

“But one does capitalize the initial letter of the first word in a

*sentence* following a colon, as then the colon is functioning as a

terminal mark of punctuation, and hence the capitalization is a useful

signal to the reader that it is being used as such and what follows is

a complete sentence and not a list of clauses.”

Scott Catledge