I ahve the PMDG777 at 21,000 and the contrails are black and have squares coming out of them. Any ideas? Don't worry about the power unit, that is being worked on by PMDG!! 

 

 

Edited September 10, 201312 yr by firehawk44
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You have uninstalled some addon recently which has erased some FSX default effects. You can read more about this issue here and download gauges recovery tool: http://library.avsim.net/search.php?SearchTerm=gauge+recovery&CatID=root&Go=Search

 

I'm 99.99% sure this will fix your issue  ^_^

Well, I am 100% sure it will fix it, cause it did! Thank you very much for the help. Now it looks like this:

 

 

Edited September 10, 201312 yr by firehawk44
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i'm glad to hear that

I'll vouch for it, too. I had black contrails and was banging me head against my keyboard until I found this. Yep, in ten seconds I had my lovely 707 smoke back and no nasty black squares making an unrealistic -- albeit impressive -- display. Thank you for posting, and thank the person who made the program.