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I type @ sign in the preview, whenever i click other font the preview of @ is change instantly.. i thought it was a font problem, i flat the layer nothing happen... Can anyone please help me... Only @ (at) is the problem!

The Commercial At (@) symbol is used as a variable in FontLab’s Preview Panel. That variable points to the current glyph. So whatever glyph is current in the Font Window or in a Glyph Window string, that glyph will be shown where the Commercial At is inserted.