I am newish and have trouble with one note.
Forgive me not knowing the names of the notes, but it is basically moving from this position:

Left hand third hole down covered.
Then higher up to third hole down covered and top two of the right hand covered (a fairly high note).
Now the trouble comes when I start to go back down to the first note described. It is as if the flute can't find it on the way down. On the way up, yes, but on the way down it sort of disappears.

Any experience with this? Any help?

Kelly, that sounds like you are not maintaining your air flow on the way down. That combo would normally be played in the upper octave, and it sounds like the air pressure to maintain the upper octave has been allowed to drop, where the flute shifts back into the lower octave.

When playing that combo of notes, you need to maintain the air flow evenly, or you need to think about greater air pressure when going back down, to prevent the octave shift.

This is not an uncommon problem for newer players. It simply takes a little practice. To be sure that I have identified the cause correctly, play the combo rapidly, with steady air pressure, and see if that does not reveal the problem, as I describe it. Easily correctable with practice.

This is not uncommon. Even with the best of flutes. Anytime you are playing above the octave, you will often have to tongue or attack the note to get there (to one degree or another) and you will have to break or interupt your breath a bit to go back to the octave. Simply slurring from one note to the other often won't work like it does with the notes between the octaves. Just the nature of flutes.

Oh, and the strength of your breath will likely have to be different between those two notes. Try hitting the first note (which is the octave), then stop, change your figering and then hit the higher note. Then stop, change fingering and go back to the octave. Go back and forth this way and note any differences in what you have to do to get these notes as far as breath control and attacking the notes is concerned. This may help you.

It is the high C to D. It seems I have to completely change my mouth shape around on this F# flute and it still doesn't work all the time. Any other tips? I find it frustating.

Are you sure it isn't the flute? I never have to change my mouth shape. It could be that the flute isn't quite right.

How about doing the diagram thing to show us what you doing: i.e. use x to indicate closed holes and o to indicate open holes, and 1/2 for a half hole, and then going from mouth piece on left to foot on the right, diagram the fingering you are starting with, then diagram what you are changing to. That will enable us to more easily envision what you are doing.

thanks all. You got me motivated to call the flute maker and he came over and did a bit of filing and changed my bird. It sounds much better.

Wow. A flute maker who makes house calls.....now that is SERVICE!

No Kiddin! Hey Kally You better hang on to that Dude cause thats Real Service for sure!!! Many Blessings...Robert

That was why I bought from a local craftsman, he gives free tips and fixes problems. Well worth it.