Screen flickers on IGEL Thin Client while using XenApp 6.x (EnableOSS)

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When you experience flickering of certain (in our case on blueish) parts of an internet website which being connected to a XenApp 6.x farm using a IGEL Thin Client you might need to read these Citrix articles :

CTX133935 – Flickering or Other Display Issues Might be Seen when Adaptive Display or Progressive Display is Enabled

and

CTX128332 – Images are Tinted Blue in Published Photoshop

This can easily be eliminated by setting the following setting in the setup of the Linux thin client:

IGEL Setup -> System -> Registry -> ICA -> wfclient -> enableoss -> ◘ Enable off-screen drawing.

Unthicking this setting eliminates the problematic progressive / adaptive display feature when using OSS (Off-Screen Surfaces).

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