Hi it happen after update to 4.7.8 i do small change in element in schematic (new package for resistor and crystal) i save it go to pcb and import changes. after this i see many DRC error - for example two components with 3.3v pads are connected with GND line (Maybe the picture will explain it better) here is before importing ![enter image description here][1] here is error after importing changes ![enter image description here][2] on schematics ![enter image description here][3] its look like it change pin on U8 from gnd to 3.3V after importing. [1]: /editor/20170727/5978f5d89d176.png [2]: /editor/20170727/5978f62f04d9f.png [3]: /editor/20170727/5978f6aeb7e88.png