I've recently replaced my chain.
I had a fantastic old chunky british chain. No idea of the brand and have gone for a BMX chain.
I've got correct chain line and tension.
However, last night and this morning, I noticed that if I really trod on it hard, it felt like it was skipping a cog. The cranks would skip back or forward, but the wheel wouldn't slip or skid.
Anyone got any idea what might be going on? Its a really weird feeling.