Sorry guys, for posting this late. The problem has been solved.
It's purely a problem due to the ground mesh being an opem mesh. I was testing this level of somebody else and found the problem, but today morning I realised that the problem could be due to open mesh.

Quote:

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this also happens if the camera is in a shadow volume

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z-fail method does not takes camera into account .

xXxGuitar - Really a nice idea that only a person like you can come up with .

Shadow - I wont even think of alchol even in my dreams. But nice try .

Edited :

Shadow969 - This is your level that I was trying to use the z-fail method, you lazy bones, couldn't you create the playground as a closed mesh? . Well I have another problem with your contribution, it wont run with the latest A7 7.05 update. Please look into it .