Logo in Header

Hi,

Having problems with images in Slidr – but right now need to fix my logo in header. Was fine yesterday, not today. The logo is stretched all of a sudden – any ideas? I disabled all plugins incase of an update but did not make a difference. In the space of yesterday and today I have only created two new articles. Not added any new plugins, edit any CSS or coding etc etc. Please help! I am going to have to just remove the logo to remove the problem, which isn’t great.