There seems to be a bug with a few users of Summit 8. The 8th edition calculations in Summit 8 are not effective until 1/1/24 so you can still run current calculations in Summit 7.5. You can downgrade back to Summit 7.5 while we fix this by running the Summit 8 installer again and selecting the remove option. After Summit 8 has been removed you can reinstall 7.5 with the installer linked below.
If you need to use Summit 8 you can fix this bug by going to C:\Users\%userprofile%\AppData\Local\EnergyGauge\EnergyGaugeSummit or %localappdata%\EnergyGauge\EnergyGaugeSummit in File Explorer and delete the rstEGSSettings.tmp file then reopen the program which should allow you to click on the space tab but you will not be able to use the Feedback Setting at the bottom of the pages.
