I recently had to open my earliest KiCad effort, which was a couple of years ago, using the latest release of V4 at that time (~ June 2018).
I got this message when starting EESCEMA (I have added clarification as [ ] and some punctuation to also clarify what I THINK the intent is):
*This schematic [created in v4] currently uses the project symbol-library-list look-up method for loading library symbols.
KiCad will attempt to map the existing symbols [in this schematic] to use the new symbol-library table. Remapping will change some project files, and schematics may not be [back-] compatible with older versions of KiCad. All files that are changed will be backed up to the “remap_backup” folder in the project folder should you need to revert any changes. If you choose to skip this step, you will be responsible for manually remapping the symbols.*
OK…so that is where we begin this problem.
When I run the re-map…ALL of the remapping fails, and the entire symbology in the schematic is replaced with those lovely and entertaining squares filled with " ?? ".
Would anybody be able to explain to me what is going on here? Is there a problem with the Environment Variables now?