Subtools not showing up !


#1

Hi, I am new to Zbrush and have been facing a slight problem today. I started working on a sphere and after getting the base for the torso of a creature I am attempting to sculpt, I decided to add a Cylinder Subtool for the leg.
Yesterday, it worked fine when I was testing out the subtool panel.
But today, as I click on Append and then choose the Cylinder, it doesn’t appear at all! I checked to see the Subtool list, it wasn’t there. None of the models are appearing. Even the Insert option generates the same result, nothing appears. Why is it happening?

I am sure I am missing something, and since I am new to ZBrush, probably, I am doing something silly.
Can anyone help me out? Thanks in advance.