XenApp 6.5, starting one published app closes another that is already open

I recently replaced my Server 2008 R2 Storefront 2.5 VM with a new Server 2012 R2 Storefront 2.6 server.

After replacing, I am finding that users can only launch 1 published application at a time.
Eg, if a user is inside their published desktop & they launch a published app, their published desktop closes.
Then if you relaunch the published desktop, it re-connects to the previous session and you can then see the published app open on the desktop waiting to be used.

I'm guessing I have messed up our session limits in some way. Just not sure where to check. I don't think I have changed anything in the AppCentre. Only change should be the new Storefront.
Who is Participating?
Sekar ChinnakannuStaff EngineerCommented:
Did you tried this registry settings? If not give a try and let me know the update
HowzattAuthor Commented:
Perfect! Thanks.
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