What does per Wlan Band select and load balancing do ?

Good morning.....We recently upgraded our controllers from 4.2.185 to 6.0.188 and have noticed many clients having connectivity issues. We have Aggressive load balancing turned off globally but have noticed that band select and load balancing are enabled on the
Wlan. Are these settings mutually exclusive or do they do the same thing ?  Does the Wlan setting override the default ? We have noticed that there is
output doing "debug dot11 load-balancing"
Thanx.....Dave

I believe we never had load balancing turned on when running 5.2 code. We jumped from 5.2 to 6.x temporarily and then to 7.0 within a 30 day time frame this summer. We're a large university and we had very few users on WiFi during that time.
The Macintosh laptops are having nothing but trouble since school began, and I have gone over everything and found that band select is turned on as well as load balancing. Since band select didn't exist in 5.2 (I believe) I know it wasn't on. As for load balancing, I don't believe it was on, and I discovered it was turned on when recently reviewing our configs.
The Macintosh laptops have been debugged and our Mac gurus tell us they're getting a message that equates to "the AP is busy, or the AP is full". This leads me to believe that load balancing got turned on during the upgrade and we didn't notice, which caused the Macintoshes to have issues.
We don't have any VoWiFi clients so we don't have to support them, and we don't officially support smartphones, either.
I turned off load balancing and will see how it goes....
Thanks!

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