Disappearing Clouds help please

I am experiencing a major issue which I just cannot seem to solve.

I have been using various weather engines such as opus and active sky next and they are excellent and I use them in connection with REX 4 textures.

Now the clouds are excellent and true in respect of real weather but when I climb above 10,000 feet or so the clouds just vanish out of sight and is so frustrating.when flying at say 35,000 feet I do not see any clouds below.

I have taken the matter up with both opus and ASN but solution to the problem has made any difference.

I therefore feel that this is a system issue but I do not know where to look for the problem.

I am therefore wondering whether anyone may have any possible idea as to what could be causing this problem.I have tried the swarm cloud fix but with no success.

I would appreciate any help/assistance please.

Michael