Just updated to version 6.4.2 1297 I found that this update fails to see my external firewire drive when it is connected. However, it is seen if I select "Display all Storage Devices"
The previous version 18.104.22.1683 detected the firewire drive normally, without "Display all Storage Devices" selected.
Don't know if this is a bug, or that the firewire detection has been removed from 6.4.2 1297
Have reverted back to the previous version for the time being.