Running 5.1.5 as standalone. Have a text track with BCC Glow Alpha on it. Everything looks as expected in the composite window. I choose export current frame, and the resulting .png file doesn't have the filter on it. I don't see anything obviously wrong in my export settings. After Red finishes exporting the .png, the text shadow disappears from the composite window, only to reappear when I either do refresh image or click anywhere in the timeline. Exporting the comp as .mov produces the proper shadow.