If you are a Photoshop CC user you may have updated to the latest 2014.2 version released yesterday that has some minor updates added to it.
No major changes noticed so far but here is however an annoyance with the new version – a “welcome” dialogue that appears after a delayed start and stops you from using the program as usual before clicking the thing away.
It is possible to turn this off but Adobe has decided to hide this option and not put it on the opening screen (where it belongs). To turn off the welcome dialogue select the “New Features” tab and click the relevant box – you may need to scroll down to the bottom of the dialogue depending on the content of the page you see.