Flip not working in Player (PC version)

I work on a P.C.  I have just downloaded 3.4 Builder and Player this morning.  In Builder I have an animation that is made up of two pings.  It is a tadpole swimming.  The first image bends the tadpole to the right and the second image bends the tadpole to the left.  When played it looks like the tadpole is swimming.  In Design I set up a linear animation which bounces.  I indicated that flip should be activated.  In Interact, the animation is perfect.  The tadpole swims to one side then flips and swims to the other side.  However, when I share to Player, the flip does not work.  So the animation looks as if the tadpole swims to one side and then swims backwards to the other side.  When I publish the app will the animation work correctly as in Builder - Interact or incorrectly as in Player?