I recently cloned an existing project and when I edit the PCB it is really slow to move objects. I have rebooted my computer with no improvement. I also tried the same edits on the project that I cloned from and it works just fine. I am not sure when the slowdown happened. I suspect it happened after I deleted the existing copper pours, but it could have been something else. Is there a way to fix this problem for this project? I have never had this happen before, and it is a problem only for this particular project. UPDATE: I have tracked down the reason for the slowdown. It was when I converted the PCB from 2 layers to 4 layers. I tested pasting several components at once into the 2 layer version and it was instant. When I tried in a brand new copy of the 2-layer PCB converted to 4-layer, the paste took 40 seconds. Is this a bug? UPDATE 2: I have discovered two things: 1\. There is a bug when converting a 2\-layer board to a 4\-/ayer\, it results in a big slowdown of any edits\. 2\. The workaround to this bug is to create a new 4\-layer PCB and copy/paste parts & traces from the 2\-layer PCB to the 4\-layer PCB\.