Two after a full stop, one after a colon. I believe I too was originally taught to use two after a colon, but it seems somehow redundant to use more than one, so that's what I do.
I've used computers for as long as personal computers have existed and have never, ever had the use of two spaces cause a problem, never heard of it causing a problem, nor can I see how it might cause a problem. Of course, if you carry that two-spaces-after-every-full-stop habit with you over into programming....
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