Everything turning blue in Photoshop

Hi everyone,

Yesterday I created some stars and used color overlay on them to make them blue.  I then linked the 5 layers of the stars together.

When I came back to my computer today, everything I do in Photoshop turns blue!

For example:

a) Creating a new rectangle, it appears blue on the canvas, even though the Fill color shows it as yellow and the layer in the layer panel shows it as yellow.  FYI, when I export to PNG, the rectangle remains blue.

b) When I press Ctrl+Alt and drag text WITH the blue stars the text suddenly becomes blue too.  Changing the text color does not work, just like it didn't work with the rectangle above.

c) When I copy a screenshot and paste it onto my canvas, the entire screenshot appears on the canvas as just one big blue rectangle.  However, if I first copy and paste one of the text boxes and THEN copy & paste the screenshot, it pastes like normal.

Any idea why this is happening and how to resolve?

It's really really holding up my work.

Thanks!