This is a very weird problem, and I can’t find any info about it.
The clip hasn’t gone any changes or renders outside of Premiere. The project hasn’t changed either. I have used these clips (in this project there are two) in the project about a month ago and everything worked fine. Now, when I load the clip in the source monitor, I can only see 4 minutes out of the 60 minutes of the clip (it was a full DV cassette). And when I drag it to the timelime, there are these strange marks on he clip (shown in the capture) and it shows nothing when I play in the preview screen. Also, it wouldn’t let me extend the clip for more than the 4 minutes that it shows me in the source monitor.
I’ve also opened another unrelated project and saw that some of the clips there show the same problem. I’ve uninstalled and reinstalled Premiere Pro but no improvement was shown.