ZBrushCentral

Unable to edit parts of mesh

Hi!
I recently started using Zbrush for a school project. After a couple of days of sculpting, I was only able to edit some parts of my mesh with really big brush sizes, and with normal sizes parts of my mesh wouldn’t be affected even though I’ve got 6 mil polys.
Nothing is masked, tried reseting Zbrush and using other computers. My topology is fine, and I use to be able to sculpt every part of the mesh.

I’ve searched Google, forums and asked around with no solution. I’m really stuck on this project right now and
would really appreciate some feedback, Thanks!

Check your scale. Tool.unify.
Do this on your lowest subdivision level.

You can also check this in in tool.preview as well.