I recently had the issue that my buildungs downgraded after saving and reloading or just dissapear. I also had the issue that the consultant building had no upgrading botton and was bugging out i couldnt click on it or open the settings in addition to that the button delete or sell doesnt work either on this particular building. I cant even click on the statistics of this building.
I would be very greatful for any kind of help and sorry for my english im from germany :)
Try making a manual backup and load that file. To make a manual backup, on the title screen got 'more options'>'game data'> 'backup game file' and select the colony you are currently playing on.
Then follow the same path, but instead of making a backup, do 'restore game file'. And see if the saving works or not
Archmage Of Nations Of Oz[NOZ]
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It wasnt helpful just like before same issues. The consultant building when selling wants to sell the last building i have klicked. I personaly think its a game issue and has nothing to do with my particular sage.