Hi Guys,
Firstly wanted to say how much I love Z Brush, it’s so intuitive and fun to use and whilst my inexperienced skills are nothing compared to some of the inspiring stuff on here i wanted to say how much I enjoy using!!! Great work guys! 
I just wanted to mention a bug that keeps causing a crash though,
When working with z spheres upon hitting “A” it causes a crash every time, least it does for me.
Currently using Version 4R7 P3 64-bit on an iMac 4Ghz Core i7 16GB ram AMD Radeon R9 graphics card.[FONT=Verdana]
Anyway, hope this info is of help.