I am using 8.4.3 on Linux and I cannot open schematic files created with 7.4.0 a year ago. When I double click on the schematic file, the board opens. When I try to toggle to the schematic, nothing happens. There is no error dialog. A quick validation of the sch XML using Python did not indicate any errors.
I have attached a zip containing the offending sch/brd combo.
Any ideas?
Thanks,
Peter