I got the game a long time ago back in Jan 2015 or something but just recently decided to have a look.
Managed to get the portal to scare the shizzle out of me when it appeared but there was only a bump something and a safe location. Both of which took me back to where I was.
I might have to try on my home PC as I'm on my work computer at the moment. I'll keep trying - thanks for all the suggestions so far. Much appreciated. Good to see the community is still as helpful as ever.