I have been through the disussions on Steam and there is a walkthrough by Marona who mentions that you have to experience both the Black shadow (which I have) and the Red Vision which I haven't she recommends hanging around until you do, so I have been hanging and hanging until I go fed up and will try again tomorrow. Thanks for all your troubles.
Having watched several youtube playthroughs I came to the conclusion it was nothing I had done, so I went back to options and turned on all the graphics I had turned off (since my graphic card is low end) and now I am living with the flashing but things are starting to happen to me, so I can only guess you need all the graphics they set you up with to get anywhere