Layers problem

[NancyA]

What did I hit to cause this?  The mask is a funny looking box and doesn't show my black/white masking.  I hoped closing it out and reopening would fix it but no luck.  Has to be a setting I hit possible in blending options??

[Damien Symonds]

Your thumbnail size is on "None".

Choose "Panel Options" from the Layers Panel submenu to change it.

[NancyA]

Thank you!

[Damien Symonds]

I've never figured out how this gets changed by accident, but it happens to everyone from time to time.

[NancyA]

I was baffled because I had to dig to find where to fix it but I had gone to blending options via right clicking and probably hit it aiming for "blending option".  I could have researched but you were much quicker   thanks!