After effects preview is greyed out

I saved my AE file correctly and closed the program. Now, when I reopen the file, I can see everything was saved yet the preview will not work. I can do everything else except preview it, I cannot even see the footage at all. What can I do, what is the issue? This has happened before but I did something and it worked again. I do not want to keep guessing what the solution is, please help. I have scrolled through the view tab, but I do not see anything that would allow me to see my preview screen...

What is a "preview screen" in your vocabulary? A Comp Viewer? A layer Viewer? A source Viewer? From your description it sounds like you actualyl haven't created a comp and the project is simply opening without the comp viewer, which automatically will appear once you actualyl create one. and of course perhaps check your workspace and reset to the default one...
Mylenium

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Ok guys...I got it...
Its not a *mov that it missplaced, its another dynamic link to AE...so dynamic link to dynamic link seems not to work? I accidently linked that clip and worked on it in AE in the old aep from yesterday..but still wondern why AE get confused loading it...the "old aep comp" is full with others comp...could that be the reason...?

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I never close the PLD when previewing.
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Thank You, Jim -
Unfortunately that specifically did not work.
Based on another comment sent to me, here is what did.
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Magic.

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Hopefully this is a simple fix. I've encountered an issue with PB filters and After Effects's variable preview resolution. Consider this simple kernel:
<languageVersion : 1.0;>
kernel gridTest
<   namespace : "quarterlightpictures.com";
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    version : 1;
>
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I've figured it out.
If you test like so, it works!
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Thanks that worked!
I thought that changing the frame rate in the composition settings would have worked.
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After effects preview is greyed out

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