Description:
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When i use imagefttext such with an angle of 180 i get the error:
imagefttext() [function.imagefttext]: Problem rendering glyph

With an angle of close to 180 (between 179 and 184.6) but not equal to 180 i do not get an error but the text simply won't be drawn. 
With an angle between 177 to 179 the text will be drawn but stretched vertically.

This problem occurs with almost all windows fonts with a few exceptiosn, those being the Chinese ones (SIMSUN.TTF and PMINGLIU.TTF)

With:
GD Support  enabled  
GD Version  bundled (2.0.34 compatible)  
FreeType Support  enabled  
FreeType Linkage  with freetype  
FreeType Version  2.1.7  



Reproduce code:
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$image = imagecreate(512,512);
imagecolorallocate($image,0,0,0); 
$color = imagecolorallocate($image,255,0,0);
imagefttext($image, 21, 176.9, 256, 256, $color, 'ARIALNB.TTF', 'Hello World');
imagegif($image);

The font mentioned here is from the windows/fonts directory (just copied directly in the same path as the script)

Expected result:
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I expect to see a pictures with hello world written on it upside down.

Actual result:
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With an angle of 180 the error "imagefttext() [function.imagefttext]: Problem rendering glyph in ..." is thrown, close to 180 the text is either not drawn or is stretched.