So one supposes that EWQL should be clear on its website that expecting Play 32-bit to work is unreasonable because it doesn't, it isn't "backwards compatible".
"The 32 bit server is for any remaining 32 bit software instruments you use." I did not know that! I believed that both instruments and FX worked in VE Pro.

@aptmusic said:

Kontakt and PLAY

At one time Play would not work at all in VE Pro. Of course EWQL said this wasn't up to them, even though it required them to address it before it did work. It was quite some time before this happened iirc.

The solution is very simple. If you turn off the Kontakt memory server, which is not really necessary, you can then load both Play and Kontakt v-frames in thesame m-frame in VE Pro's 64 bit server. Anyone in the LA area is wlecome to come to my studio if they choose not to believe me and I will prove it to them as long as they promise to come here and report what they observed.

Or load Play in the 64 bit server and Kontakt in the 32 bit server. Why is this a problem?

One does need to separate the two. I did not find that turning KMS off a solution. Whether I believe you or not, my experience was 'Isolate Play or die'. But I believe that KMS is necessary when it is, :shrug:

Yes, Kontakt and Play in the same instance is not necessarily necessary. :) So it's not that "32-bit no longer works", we have a situation that never worked. The OP has nothing to do with this does it?

Once again, it is simply not true and i can prove it here at my studio. If I could figure out how to post a picture here I could also show it :)

While Play+Kontakt in VEP will sometimes work, often it will not. It seems totally dependent on the order in which patches are loaded and what patches/libraries you are actually using.

VSL team pointed out that both Kontakt and PLAY are not programmed in a very nice way, which can/will lead to problems. This is what we are seeing here apparently, but as I already said, I doublt neither will do anything about it until it becomes such a massive problem where people generally can't get it working. So we'll see if it gets to that point sometime. It seems the use of custom GUIs in Kontakt is really something that has brought forward massive problems. And apparently the QT function calls/iLok code of PLAY can crash as well.

Mr Ashermusic, because your are not the only one who have worked with technology for a long time

I suggest you looking at the two videos which I published on Youtube.

When you speak about evidences, I bring them to you.

The first in Yosemite with Play 4.2.2 in VEP 32 Bits :

The second in Mavericks with Play 4.2.2 in VEP 32 Bits on my Mac Pro 2008 in Slave :

In the two examples the patch of Play 4 are all Master Keyswitch Patchs !!

I suggest also to you to ask Eastwest to make a update quickly to regulate the problem!!

FULL STOP !!

I just tried this with keyswitch patches in the VE Pro 32 bit server in Yosemite. . (There are no "master keyswitch patches in the Hollywood Series, only EWQLSO so hiopefully I loaded what you did (sus-short). I was able to successfully load them for HS Diamond Vln 1, Vln 2, Vla, Celli, and Bass, and then HB Diamond for French horns, 3 Trumpets, 2 Trombone and Bas Trombone, and Solo Tuba. I continued with HOW Diamond Piccolo and then when I tried to add Flute at that point  it did indeed crash.

I then tried the same thing in the VE Pro 64 bit server and loaded KS patches for all HS, HB, and HOW instruments with no crashing.

Personally, as a composer who uses these tools and gets paid as a Logic Pro consutant to help others use these tools effriciently,  I have zero interest in how a 64 bit capable plugin behaves in a 32 bit host in a 64 bit OS version that was released only a week or so ago. 

But if you do, email me the issue and I will gladly pass it on and see if the Play developers at EW do.

jasher@eastwestsounds.com

Thank you for your answer.

Have you tried to see in Yosemite if the memory server of Play 4 load something when you start loading sounds in VEP 32 with Play, because this is the issue and only that !!

No I have not, and since I am not an EW tech support guy, only an alternative conduit to it,  and since as I wrote I have zero interest in ever doing that or advising anyone to do that, I am simply not willing to spend any more time on it. Email the issue to me if you wish and I will pass it on.

My observation as a user of NI Kontakt and Play, hosted in VE Pro with occasional other instrument plugins. There are two things going on here.
I had to isolate Play first of all due to the need for memory servers for it and Kontakt before these were 64-bit on Mac; and second of all Play was not playing nicely with anything at that time.

Currently I find that crashes frequently involve elaborate GUIs which at times do not play nicely within VE Pro. My main culprit is FXPansion BFD2 as a 64-bit plugin; which crash reports contain a lot of stuff about Apple GUI handling. I have this when the only other plugins are Vienna Suite.
It could be that Play issues involve a fight in the sandbox with other things, ie., Kontakt although I can't verify this in my system, I think it was some hinkiness with Play and corruption or garbage somewhere in its path. But you may find that separating it from eg., Kontakt as per your setup at this time alleviates this.

And you may find that it is a certain Kontakt library's GUI [eg., LASS, Orchestral Tools Berlin] that isn't going to cohabit with Play, and even with a certain Play library.