In previous versions, when i copy & paste a part/asm/psm into an assembly, the part appears relative to the pointer on the screen. But in ST10, the copied part always seems default to the origin of the assembly (0,0,0) which means i have to keep going to the origin to find the part to add contraints.
I see a couple behaviors when copying parts etc.. from file explorer, or just adding another instance of a part already in your assembly. If a part is added by dragging from explorer into the SE view pane then the part goes to my cursor ready for relationships. I see the same if I hit CTRL_V to paste the part from explorer or if I copy a part already in my assembly.
If I hit the paste Icon on the Home tab, the part drops into the assembly but not at the assembly origin. If you hold down the SHIFT + The Paste command on the Home tab, it drops at the assembly origin.