I have a similar issue but over the LAN at home and only seems to happen with channels with vertical polarity. Have tried different images eg Gemini, PLI with CCcam 2.05.
My current setup is Greywolf (Midnight) as a cardserver with Gemini 4.2 CCcam 2.05 client and PLI (z80 Oz image) with EMM, EMK updating switched on. The Gemini image seems to have had the least pixelation so far.
For me this is still a work in progress and my next steps include:
1. Turning off the EMM/EMK updating - (obviously this has the problem of the card needing updates)
2. Only allowing 1 Dream to do the updates
3. Using Grey Wolf (early version)
4. Using Mgcamd ILO CCcam
My suggestion for you in your case would be to see if your problem happens over your LAN at home.
You may also need to provide more details on the images being used, server setup etc.
Other forums members here I am sure will be able to give you some ideas on what to do further as well.
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