When I delete a file (within Similarity) while the program is still scanning the library, that file shows up in subsequent comparisons. Meanwhile it should also be erased from the cache, so it does not show up as a duplicate ever again.
This became very evident with one of these files that compares at 100% with many many other files (i think as pointed out by someone else , it is those files that Similarity is unable to decode properly, ie. they do not play in WMP) ... the file just kept showing up again and again, after I did Right-Side-Delete of it several times (with Retry after the first time in Vista).
Seb