AE is Garbling Some Frames During Export

i exporting:

• 640x480 composition
• "best setting"
• "lossless" (with audio)
• .avi

 

i running:

• lenovo y470
• intel i7-2670qm quad-core
• 8mb ram
• ati radeon hd 7690m

 

most of video renders correctly, except 5-7 frames. single frames , typically appear in last 30 seconds of rendered file. looks like:

 

the strangest thing these frames garbled frames ae project worked on over month ago.

 

i did clear ae disk cache because wanted try using storage device. other that, have not done out of ordinary. have had garbled frames once of twice in past when trying many things @ once on computer while ae rendering ray-traced composition. re-render , turn out fine. plus, never frames project.

 

things have tried:

• restarting ae
• restrating computer
• clearing disk cache
• moving disk cache folder
• moving disk cache usb3.0 flash drive

 

i have rendered composition @ least 4 times , have had similar results.

 

thanks - bewildered. (and can't work done!)

try deleting prefes holding down option (or alt) , shift when boot ae.

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