Hello Sir Ivan,
As a very common known Premiere bug, when it imports MXF files from the folder called "CLIPS001" - which is automatically generated by cameras such as the Canon C70 - the software renames all clips as CLIPS001. The easiest workaround is to rename that folder with any other different name (e.g. CLIPS002).
Now, WT has always imported the clips with their original/correct names without the need to rename the CLIPS001 folder... until today.
Might you think of a reason for this?
Many thanks!
Sir Alex