by Dax23333 » Tue May 12, 2015 12:32 am
Can you be a tad more specific? Maybe a screenshot?
Not really sure what your problem is, but it could be you've activated a debug option accidentally. One of them puts little white boxes around dropped items and other entities, not sure if there is one for blocks. Anyway, some buttons to try pressing. Could be fun.
f3 + B toggles entity hitboxes (white boxes around entities)
f3 + T reloads all textures (could be worth a go)
f3 + C makes a debug crash (because... why not?)