[Daniel Hernández]

Joe! Thanks for your response. Since I needed to get started with the editing I ended up transcoding all the files to ProRess in another software (even though it increases the file size by a lot) and then imported back to FCPX. I’ll try to finish this up, make a backup copy in another drive and then start the process of checking the external drive with Disk Utility and the other tools you recommend.

I’ll post something here if it fixes the problem.

Thanks!