Digital Editions copy books on launch

I've reinstalled ADE after a PC breakdown, downloaded my e-books and imported them to ADE.

During the next half hour ADE continue to copy some of my books, up to 4-5 copies.

These copies I delete from within ADE, and delete them in the ADE library as well.

I deselect the *automatically download your synced books...' preference option.

Close ADE and relaunch program.

On relauncing, ADE continues to copy the same books.

In sub library 'Annotations' I delete the copied book titles,

but now ADE won't close down.

Job handler always handles programs.

On re-relaunch ADE have copied the books and also registered the copies in Annotations.

Where is the instruction to copy these items stored?