Never came across this problem with flashing lights till Tuesday morning cycling home from work in the dark.
It was pitch black, not a thing in sight, I was all lit up with back and front lights not flashing, and high viz clothing cycling steadily along the cycle path, when all of a sudden out of the darkness a very intense beam of flashing white light was suddenly turned on very close to my front and shaking violently from side to side and aimed high into my eyes. As it got closer I still could not work out what it was as it was so blinding, then I noticed it was a cyclist when we was only yards apart, I was tight to the left but from the swerving action of the light could not work out the others riders intentions at all. At the last moment he swerved to my right and saw he was on a mountain bike going hell for leather and pulling on his handlebars swerving from side to side frantically.
Would you believe it 50 yards further on exactly the same happened again. I cannot understand the logic of leaving your lights off till you see someone else coming the opposite way. What happens in total darkness if two riders approach each other with the same mentality.
Wednesday morning, same happened again, but this time the first rider had his lights on, still flashing and aimed high, maybe he had a near miss and learned to leave them on, but once again cycling furiously, this time though he never saw me at all till we nearly impacted, I was tight to the left and he just came straight at me, once again I could not work out his intentions, then I saw his face lit up, probably by the light reflecting back from my high viz jacket and my headlight, looking straight downwards at the path, just as we was about to collide and before I could shout, he notices me, his face was a picture of shock, swerves to my right and shouting the "S" word at the same time as he scrapes past.
Dreading next Thursday and Friday when I probably meet him again, hopefully he will have crashed into something by then to learn him the errors of his ways