I recently bought an intro level tablet which came with Zbrush core to learn how to sculpt a bit better before I decide whether or not I wanted to purchase the full version of Zbrush. I'm not sure if I'm just "dynameshing" wrong or if it's core. I'm a bit more comfortable in 3ds max when it comes to controls so I figured…
Zbrush do have this problem too sometimes if you dynamesh lots of object elements at the same time. You can try to dynamesh one by one until you got all combined, normally this works fine for me.