Photoshop loader problem

Hi chaps
Got a strange issue today. Loading a PSD file doesn't automatically appear other than the frame it loaded on, but more importantly the layers tab doesn't show other layers, only merged.
It seems to be the Photoshop file, as other ones work ok, but I even tried dropping the new images into the working PSD and it still won't work. they are 8bit, RGB just like the others. doing my head in!
Any thoughts?
Got a strange issue today. Loading a PSD file doesn't automatically appear other than the frame it loaded on, but more importantly the layers tab doesn't show other layers, only merged.
It seems to be the Photoshop file, as other ones work ok, but I even tried dropping the new images into the working PSD and it still won't work. they are 8bit, RGB just like the others. doing my head in!
Any thoughts?