DR not seeing MXF files

Just installed to 16.1.3 and tried to load in my mxf video clips, which have worked before easily,
now DR doesn't see them. What went wrong?
Thank you, if anyone has a solution? Do I reinstall just 16?
Windows 10

That's not much info to go on. What camera produced the files? What codec and resolution? What bit depth? Free or Studio version?

Jim Simon, That's it, Thank you, I was under the assumption that you could change the FPS in the project, But now I know, Thank you,
Stan Chang