this might be stupid but in zbrush lightbox i have seen defaultsphere.zpr and polysphere.ztl. is there a difference between the 2?
The ZPR is a project file and the ZTL is just the tool. Project files contain everything you are working with when you save them (through the File palette). Loading the project file will also replace everything you are currently working with whereas loading the ZTL will simply add the polysphere to your current project.
ok thanks