read-error on images/pictures

[keskkin]

I have seen there are already similar posts on the forum.

My problem is that all of a sudden some pictures I had disappear, leaving the message "Read-Error" where the picture was.

I am not sure if the pictures were inserted using Insert-> File or using the copy-paste method. Is one way better than the other?

I have these pictures on a table which is in turn on a frame, and pictures are set as a character. Just some of the pictures disappear, not all of them.

I have this files on my dropbox folder in my computer.

Any lights?

Thank you very much in advance.
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