Ashley yes, I know that WebGL from properties turns on /off shaders in editor, but it also turns on/off shaders for preview and export.
And like I said few post above "it's really annoying to keep switching webGL on/off every few seconds to run preview and check if you placed the object on the layout where you want it "
As for the capx, yes as well. I have four projects like that currently (two of them are shown in video files I've post above). When I start them all look fine but when I start modifying layout in the editor it breaks - usually selecting one of objects is enough. And yesterday I've noticed that this is not only Tint effect issue. Same happens with all effects that are modifying colors - Adjust HSL, CGA, Set color, Gamma and few others.
And in one of the videos you can clearly see that this affects only layers having objects with effects. Button (Sprite) is moved from one layer (no object with effects on this layer) to another layer (few objects with effects applied) and it's displaying incorrectly straight away. Moving it back to previous layer - display as it should.
Please believe me, I would not bug you about that if I new there's an issue with my driver, but same things happens all the time on my pc with geforce 780 (newest driver) and laptop with Intel and ati cards (newest drivers as well). For me it look like Layout editor have some hard times trying to figure out how to display effects. If you want I can send you all that original, not change and "infected " projects so maybe after playing with them for some time you will get same result.
and btw running file posted by 
GeometriX shows fine for me. but again after downloading my own file (with issues) I've attached above works fine for me as well...
Edit. Its not only spritefont but for most of the objects probably - I've seen this with sprite, 9patch and spritefont