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I think that from ver. 2.1 Global shadow+distance=0 parameter work different, not like in ver. 2.0.
The symmetric shadow (with distance=0) is not so strong and distanced, as in previous (2.0) version (V2.0 SETTINGS:THEME DEFAULT, COLOR =0x000000, ALPHA=1, DISTANCE=0, ANGLE 45, STRENGH = 0.5, BLUR=10, QUALITY =3).
Changing of parametres in ver. after 2.0, like strengh, blur, quality, alpha doesn't have any substantial effect (the strongest effect in this ver. with PAR:ALPHA=100,DISTANCE=0,STRENGH=100, blur=20, quality=3).

Is it a bug?

All I can say here is that we did change some settings almost a year ago in the theme file, so that decimal numbers changed to percentage numbers. You could have some mixup of files? If not, I am not familiar with this issue ... perhaps you have some link/example?