L-Ultimate Data Registration Failure

Hi There, I just bought an L-Ultimate filter for my OSC setup.  My first imaging session was last night.  I shot 103 subs at 300s.  There was a meridian flip just about 1/2 through the session.  For some reason APP won't register the subs correctly.  Visually, all the subs look fine.  With the defaults it fails to register most of the subs pre-flip.  If I loosen up the parameters to include more stars and increase the scale stop as suggested by the registration failure error message, I can force APP to register all the subs but I end up with a composite of the pre and post meridian flip images!  If I stick with the defaults and only let the registered frames go through to integration, the frames don't register to each other properly so everything is really blurry.  I took the same data and processed it through SIRIL and the image came out beautifully.  Is there a setting I'm missing for dual band data that could be causing this problem?  I basically just used the same setting I use with my OSC data.