On Saturday, 6 April 2019 01:04:22 BST Ira Fuchs wrote: > Yes. > OK, that probably explains your problem. On Macs, you can't open a GC file by clicking on it. GC *always* opens the last-used data file. to swap files on a Mac, you have to use File -> Open and navigate to the file you want to use. HTH, Maf.