Right, this is a strange issue. I have a 233 page PDF document that I'm constantly referring to whilst studying for an exam on friday. When I'm looking for particular things I hit cmd+f and search the term. This has been working fine up until now. For some reason, search doesn't work. At first I thought it was just broken in some way but if I search for any single letter - such as 'm' it highlights 'd', searching for 'd' highlights 'o' etc. If I copy text from the PDF it now comes out as jibberish. Eg - "CS304 - Operating Systems & System Software" pastes as "!"#$%&'()*+,-./&"01,)21&3&"01,)21& "45,6+*)" Has anyone got any idea why this has just started happening? It's only this PDF too.