I've noticed sometimes when I'm mining rocks, both in the town and cave, that I won't get any resources. Sometimes I will see the drops animation, but the items won't go to my inventory. Other times there is no animation AND the items won't go to my inventory. As in, I won't get anything at all for multiple rocks that I've broken.

Same here. It almost looks like the drops spawn and then fall through the floor. In the cave I notice it usually happens to the left just before crossing the bridge.

Please ensure you are playing on the most up-to-date build as this was fixed yesterday(although if it continues to happen in v 0.9.3.780 do post again and we'll look into it) Thank you!