Make sure there is a fill attached to the material you are using (there are several brick fills available). I assume you are in open gl for your 3d viewing. There must be a texture already attached to the material since you see the bricks there. Once a fill is applied, you might have to play with the fill size to get it just right.
AC19(9001), 27" iMac i7, 12 gb ram, ATI Radeon HD 4850 512mb, OS 10.12.6