P: Most functions in Edit, Image, Layer, Select and Filter grayed out for image opened from LrC

Disable the start up page in photoshop & re open /  or Open photoshop before opening lightroom & then editing in photoshop

If you do find the Home screen useful, open PS first and forget about the preference. No doubt the bug will be fixed soon enough.

If you don't, then change the preference - regardless of the bug.

Robert, But you don't have to open Photoshop first! Just use the option Adobe have given you in Photoshop's Preferences as I said in a previous post. No work-arounds needed; just get rid of the new Home Screen, it is not needed to go from LR to PS!! Probably most PS users won't want it either; I didn't so turned it off immediately after install, before this effect became recorded.

Adobe will probably have recorded this bug in PS Home screen  as a 'minor bug'; that is one for which there is an easy solution. So no rush to fix it.

Bob Frost

Awesome! Thank you, Robert, you are wonderful 🙂 This works!! 
Yi-Chen

Worse than climate change for some 😉

Eye roll.   Having to open Photoshop first has happened in the past and it was fixed.  This is a TEMPORARY workaround and not a big deal.  This will be fixed also.   

Eyeroll. As dense as they come.

And the venting continues. 
I'm sorry the facts continue to ruin your life Geoff. 

Good solution, thank you Robert for sharing this tip.  I question Adobe's culture of not being forthcoming about the operational procedures of these programs.  And don't get me started on the hassle of Rush being 'not compatible' when attempting to install via Creative Cloud and the hoops to jump through to diagnose and resolve this issue [hint: required win10 update to a certain version].

Man, you really are a child, aren't you? Sincerely, I hope you find some help with your ego problem. If you were my employee, I wouldn't want you posting on my company's forum the presented decorum. If you really are an Adobe employee, then fully agree with Jon and an internal culture change is needed.