Rgl.snapshot creates a black file

Question

Example:

example(plot3d)
rgl.snapshot('test.png') # snapshot3d('test.png')

From today, I become a black png file.

> sessionInfo()
R version 3.0.2 (2013-09-25)
Platform: i386-w64-mingw32/i386 (32-bit)

locale:
[1] LC_COLLATE=German_Germany.1252  LC_CTYPE=German_Germany.1252   
[3] LC_MONETARY=German_Germany.1252 LC_NUMERIC=C                   
[5] LC_TIME=German_Germany.1252    

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] rgl_0.93.996

loaded via a namespace (and not attached):
[1] tools_3.0.2

rgl.postscript takes 200 seconds to save my files, it takes too long. What can I do?