If the behavior is the same in Reaper and Sonar - the VST is messed up. It's not graphic card related.

I had a similar problem with a Kontakt 5 upgrade.  What solved it for me was to reinstall Kontakt 5.  Just make sure that the VST option has a check mark beside it.  When I initially upgraded I didn't see that it was not checked!  You might try and see if this is the problem.
 

Hi:)
 
since the last update from august sonar is hanging for about 5 minutes, but only if I close the Kontakt plugin window, if I let it stay open, no problem.....
 
the problem is, I don't know if it was the sonar update or the win 10 anniversary update
 
Bassman.
 

I'm running latest Win 10 and Kontakt 5 updates without any issues in Sonar (other than specific bugs with Sonar I've mentioned elsewhere).
 
I would clean out the VST folders, both 32-bit and 64-bit, of any Kontakt DLLs, including previous versions if they exist. Then manually copy or reinstall. It might be best to search your whole system for Kontakt DLLs but I would definitely check *all* the VST folder locations configured within Sonar regardless of what is supposed to be in them.
 
Its possible a damaged DLL has not been removed before reinstalling and is sitting there laughing in the face of uninstall protocols.
 
If you've already done a thorough clean of your system for pre-existing versions, I'd probably have a look at the Sonar settings. What bit depth and frequency do you run at? Try reducing those settings and see how Kontakt behaves. NI products sometimes get a bit over-excited at higher settings and don't stop gracefully (I'm looking at you Reaktor). If no difference then return them to previous state.
 
Personally, I'd also have a nosey in the registry but I don't recommend that unless your very sure of your ability to recover from any mis-clicks in there.

Basseman
Hi:)
 
since the last update from august sonar is hanging for about 5 minutes, but only if I close the Kontakt plugin window, if I let it stay open, no problem.....
 
the problem is, I don't know if it was the sonar update or the win 10 anniversary update
 
Bassman.

That's what it is doing for me! If I open a project with Kontakt 5 and don't open the VST window, the project will play just fine. If I OPEN the VST Window, and then close it (as you might normally do) it hangs for 5 minutes for me. 
 
Interesting that it's not just my machine!

@MarioD - thanks for the suggestion. I've already uninstalled and re-installed Kontakt 5, and it made no difference.
@Roo Stercogburn - I'll look for Kontakt 5 dlls and clean them up and re-install, but I normally just run my SONAR projects at 44.1K, so I'm not doing any high bit rate projects anyway, so I doubt that's the issue. 
 
I find it interesting that Bassman is having the same issue as me! It makes me wonder if perhaps some dependency DLL got changed by one or more of the updates and it conflicts with Kontakt 5 or something...

That really sounds like the standalone K5 and VST plugin K5 are using DLLs from different locations and the VST usage is coming from an out-of-date, corrupt or non-existent location.

HI:)
 
@RooStercogburn
 
With VSTpaths all is ok, only 3 dlls on PC! 
What registry keys would you look for??
 
When I open Kontakt and I click on the Browser I can see that it is searching on and on for about 15 min. that's not normal action....maybe it's searching for a network path?? 
 
Bassman.
 

Have you recently changed file paths or deleted drives?
 
I don't have my system in front of me at the moment but Kontakt will have an entry showing where it expects to find its files and I'd look to make sure that where it is finding its DLL is the same place that Cakewalk is configured to look for DLLs.

@Roo Stercogburn
 
I have not changed anything, all paths are the same as always. Same Problem with Standalone Version, Browser is searching for about 15 minutes.
Tried to install an older Version, doesn't hang, but gives an error (your version is too old) loading my libraries.
 
Hm, looks like I have to write in the NI Forum......not a Sonar Problem IMHO.
 
Thanks:)
Bassman.