Will be good if you can share these problematic media & project. We will check at our end and report back. Moreover, are you seeing this issue only in beta version or in release version (24.6 ) also?
Hi @hannah_9211 - Are you trying to access your files from the CFcard? If you move the files to an internal hard drive do you still receive the errors? What Premiere Pro version and build are you working on? What are your cpu specs?