This is a small problem I had with my Alt-1 script a while ago, where every time I ran it and refreshed, it would still say that some files were renamed. I mentioned this in another thread, in fact, and I think I've found the cause.
At the moment I am using this Alt-1 script:
This is the only one that renames ALL files successfully without "could not find file specified" reports, mainly caused by only one MP3 album where the tags are ridiculously long - I think it had something to do with limits of the path string length.
However, the first problem came up, and I tracked it down to an album called:
It seems that the Alt-1 script doesn't like periods in the end of the tag - when I renamed it so there were no periods at the end, then the problem went away. I also noticed that the resulting folder name ended with "a.i" - a missing period.
Just so you know.