I have heard of this bug before, but this is the first time I actually experienced it.
Video information: recorded using Dxtory with a 50 frames per second limit and the Dxtory Codec (set to YUV420) to two hard drives ('RawCap'). Converted with VirtualDub to h.264 lossless (significant file size reduction).
I wanted to try again how much quality I could squeeze out of YouTube at 1080p. If I had recorded a longer video, I would not have used a lossless conversion (due to too big file sizes).