Version of AE including the point number??? OS version?? Kind of footage?
There have been some changes in the codecs that have caused some problems. Without details on your system I can only guess that your software is not up to date or that your source footage is a non-standard codec, or that you have installed some 3rd party software or drivers that are conflicting with QuickTime or other video software on your system.
Thanks Rick!, The Version is Adobe After Effects CreativeCloud V126.96.36.199
Yo know, it's strange, because i have installed in the same computer Adobe Creative Cloud V188.8.131.52 and Adobe CS5.5, with CS5.5 i have any issue, but with CC i do. May be you're right about the update, but why works fine with CS5.5?...in the same computer..
We still don't know what kind of footage you're referring to.
well, it's a simple .mov / DVCPRO50