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There was an issue with apps losing focus and not being able to be maximised on certain CWA versions. https://support.citrix.com/article/CTX463924/citrix-published-applications-minimizing-after-cwa-2206

I remeber that one, but this happens with all cwa versions. The app doesn't loose focus, it's just black for a while when restoring the app after it's been minimized. Just like the screenshot