I have recently upgraded to ioGAS 6.2 and my plots are missing from my ioGAS session that I saved in an earlier version.

A. ioGAS 6.2 does not support plots saved to gas files created in version 5.0 or earlier (binary workspace files). You will need to open the ioGAS file and re-save in version 5.1, 5.2, 6.0 or 6.1. Otherwise send file to iogas.support@imdexlimited.com and we can do it for you.