Hey there, so I've recently discovered why i might be having issues with earlier photo session pictures having a green cast to them, in LR i had the settings to the default prophoto color profile instead of sgrb which I have since changed it to and it seems to have helped. but i was wondering if there's anything i can go once the file's been saved to a jpg format. I don't have the original raw files for a lot of them and the ones i do have i'd just hate to have to go through reediting them all again. please help!
For the ones you still have the RAW and that are still in the catalog, simply re-export with the correct color profile.
If you have PS, you can use it to change the color profile: Creative Suite * Working with color profiles
If not, you may have to (re-)import them into LR and re-export as well.