Zbrush 4 R6 P2 Win7x64
Hi, Well i´m not sure if this bug has been reported before
When you insert a mesh and then press ALT the mesh will stretch. The problem comes later when you try to insert your initial mesh again . The Brush has been modified and now the inserted mesh will be allways the streched one. That´s not really usefull in my oponion. But the funny part is if you change the insert mesh in Brush > Modifiers. The new mesh selected will be same as streched as the previous one. So the IMM Brush is permanently bugged!. But not only the IMM brush you selected is buged. All IMM brushes will be now streched! 
The only solution is save the project and reinitialize Zbrush.
