[   ]   This post-effective amendment designates a new effective date for a previously filed post-effective amendment. This Post-Effective Amendment No. 66 is being filed to register Class R6 shares of DoubleLine Total Return Bond Fund, DoubleLine Core Fixed Income Fund, DoubleLine Low Duration Bond Fund, DoubleLine Flexible Income Fund, and DoubleLine Shiller Enhanced CAPE® and relates only to this share class. Information contained in the Registrant’s Registration Statement relating to any other share classes or series of the Trust is neither amended nor superseded hereby. The information in this Prospectus is not complete and may be changed. We may not sell Class R6 shares until the registration statement for that share class filed with the Securities and Exchange Commission is effective. This Prospectus is not an offer to sell Class R6 shares and is not soliciting an offer to buy such securities in any state where the offer or sale is not permitted. Neither the Securities and Exchange Commission, the Commodity Futures Trading Commission, nor any state securities commission has approved or disapproved these securities or determined if this Prospectus is truthful or complete....