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I got it to work but you have to change the dynamic setting up above once you choose dynamic... mine was stuck in light mode when I needed to select dynamic even though I was in dark mode. Give that a shot?
That worked for the desert background. That same drop down is missing from the other new dynamic wallpaper though. Thanks for pointing that out, as that is why I didn’t see that option.
 
I have a 2018 15" and I had to revert back to High Sierra after two days.

As others have mentioned here I was unable to change screen brightness, external displays would not work, and I frequently ran into sound issues on YouTube where the sound level would occasionally lower and would sound very tinny after pausing a video and starting it again. Refreshing the base resolved the issue, didn't try another browser though.

If you have a 2018 MacBook I suggest staying away from this beta release.

Agreed. Not useable on 2018 MacBook. I'm pretty sure all of these issues are just related to video drivers. The beta does not include proper drivers for the new hardware. Easy fix for apple, and I'm sure they're aware of it. I'm guessing beta 4, if there is one, should be ready for 2018 Macs.
 
Beta 3 seems to have broken Siri for me - the window will pop up with no waveform, sometimes it will say it can't hear via the microphone and have a link to system settings.
 
Hello all!
After upgrade to this verson i'm not able to run any of apple apps. like mail, calendar, app store.... please help!
Anyone with this same problem?
 
APFS for Time Machine? APFS specifications so that Alsoft can release DiskWarrior 6? Then it is a deal breaker!

You make no sense
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Hello all!
After upgrade to this verson i'm not able to run any of apple apps. like mail, calendar, app store.... please help!
Anyone with this same problem?


Nope. Everything works great. Something you did? I’d use the power on options and roll back. But....still thinking it’s something else involved
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What is the build number for the third macOS Mojave Public Beta?
Thanks

Try this. Hey Siri, I’m sorry I was not very supportive of you. Works on your gf. Ok it’s a joke
 
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