problem with audio and timings

So im currently using cubase LE Elements 8 and have just today encountered a weird problem

everything was playing back fine (recordings, midi etc) 2 days ago and then today none of the audio plays back as well as the timing being off completely. i figured at first it was the sample rate but that was fine and correct.
When exporting the project it all sounds correct and as it was 2 days ago, I have absolutely no idea what has happened and whether or not something somewhere has corrupted or something along those lines.

any pointers in the right direction would be appreciated, thanks :question: :question: :question:

Correct audio driver still selected?