strange copy object issue and render problem

Support Basics & Interface
1
  1. when i copy cobe by SHIFT+D and using X or Y to move it seems it have some another coordinates ? just like ladder

why ?

  1. why there are a strange black noise on the box ?
    untitled444444.jpg959×539 35 KB

2
  1. when i copy cobe by SHIFT+D and using X or Y to move it seems it have some another coordinates ? just like ladder

Don’t understand

  1. why there are a strange black noise on the box ?

You have two objects occupying the same space, delete one of them. Also check for duiplicate vertices (select all vertices in edit mode and W / remove doubles)

3

damn my english to bad ;D

video of problem -> i need only X copy,but seems in make copy on Z too

4

For #1: It looks like your cube has been rotated slightly. Either start with a new cube, or you might try pressing XX instead of just X to move it on the local X-axis. (Note that if your cube was rotated while in edit mode, this won’t help.)

For #2: I’m with Richard.