I wanted to try out the new DJay Pro AI 5.0.
Did it via the Lexicon to ITunes route as Djay does not read external drive serato crates/libary yet.
I think iTunes defaults back to original settings when one creates a new library and started creating folders and copying tracks to my internal.
Caught it just in the nick of time and cancelled it.
@Christiaan might be worth it to include a screen shot of unchecking these options in the tips that Lexicon shows when converting to iTunes.