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First thought - are you running "Legacy Graphics Mode"? Depending on your worker OS, Legacy Graphics migt cause issues. In general, OS=WS2008R2 --> Enable Legacy Graphics Mode (Citrix Policy). OS=newer-than-ws2008 --> Disable Legacy Graphics. I've seen various issues with this. Often Legacy Graphics was enabled in a default policy, and at some point in time, later OS was introduced on VDA's, causing issues.

No Legacy Mode involved. We can see the issue on W10 1809 and Server 2016. Will give it a try with the latest 1909 VDA.

Seen this reset g the profile fixed it for me

It is not related to the profile. Already questioned 😞

what receiver version? We had what we called "black box" issues when people were not on LTSR receiver. 4.10+ would re-create it but LTSR was golden

Workspace App 1904. We need to go with WA otherwise we are having issues with DPI scaling. I will give it a try with the LTSR receiver

LTSR VDA with LTSR receiver?

Yes 7.15 CU2 VDA with 4.9.8000 receiver

@Julian Mooren did you get this resolved? We're seeing on thin clients only with 7.15 CU4, CU5, all different versions of Receiver / WSA. Does not affect fat clients.

Not yet. We can’t see the issue when connection via an external NS Gateway same VDA. Internal we are working with HDX Optimal Gateway Routing where the issue is visible. I couldn’t test a direct ICA connection so far because of firewall restrictions.

Is it happening on fat clients, or thin clients? We see it mostly on our helpdesk staff, who have either 2 or 3 monitors, on TCs, and internal only. Switched one to a fat client and that seems to have resolved the problem.

Only fat Clients with W10 1809+1903 with 2-4 monitors.

@Tim Riegler published Desktop only or double hop scenarios?

@Julian Jakob Published desktop only.

@Tim Riegler Update: It is related to the Video Codec. When disabling the codec for compression the black bars are gone. Can reproduce with 1909/1912.

Thanks @Julian Mooren! I'll give that a test shortly.

Having an active support case on this. Tell me if this is fixing your issue

I have enabled the policy for our Test users, and will let you know as soon as I hear back.

I got positive feedback from the users today. 4/4 users are reporting the black bars are gone 👏🏽

Positive / negative feedback from our users. Yes, it fixed the problem with the bars. However, it also significantly slowed down their sessions (response time).

Choosing between pest and cholera... At the moment we don’t have huge multi media use on the sessions hosts. Maybe you open a support case and refer to my case number?

Yes, they are AMD devices.