Copying files between drives or folder

I select a folder (which includes multiple sub-folders) and the copy and paste to another drive. The file copy dialog displays some files being copying. The copy function runs for a while, then stops. But only a few of the sub-folders have actually been copied. So the copy functions seems to be faulty - only actually copying across a sub-set of the folders/files which had been selected for copying. Same thing happens the the cut and paste function

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Is the copy filter turned on? That's about the only way a copy would exclude items like that (outside of something outside of Opus not working properly).