Adobe AI upgraded on my system today to Illustrator 28 - 2024. Shift no longer works to select multiple objects or points. I use illustrator about 4-8 hours a day so I am very aware of the intended capability of the shift key while working. I have rebooted to hope for a resolve .... I can't seem to regain the functionality. My previous version of Ai did not perform this way. Bummed to consider having to downgrade back to previous version of Ai. Hope this helps bring attention.