Problem Importing .movs into AE

Hi - forgive me if this is already up, i quickly browsed AE posts and didn't see anything related.

I'm having an issue importing an uncompressed mov into AE. I'd previously created a project using this file, rendered the project and the video looked great.

I have to update the timeline with additional information. So i opened the old AE file, relinked to the same .mov and for some reason the image quality is dramatically different. It is exactly the same project and same video. Granted the video is 14gb but that didn't seem to be a problem the first time around. When i open the .mov using quicktime player, it looks great, super crisp and clear. but when i import it into AE, text in the video is almost illegible. The settings are all the same as the original project, i'm viewing it at 100%, full resolution.

I have to get this sorted today so if anyone has any suggestions, would be super appreciated. Thank you!