I have been there before (climb ladder, get on roof, tie a rope to a sturdy pipe and cross roof to window to get inside). Whilst trying at a later stage to climb back in the game tells me it is not safe - does not recognise there is a rope leading to the window. Really do not want to start the game again as going from a walkthrough I am almost finished :( Anyone experienced this bug and been able to get past this?...

that's what it is here