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glTexSubImage2D, Leopard

Hi,

when updating an Alpha texture with glTexSubImage2D there are some 
strange effects (the right most columns are updated wrong).  


glTexSubImage2D(GL_TEXTURE_2D, 
0, // level
0, // xoffset 
0,    // yoffset
258,    // width,   it woks for 256, 260, etc but not for 258! 
258, // height,  it woks for 256, 260, etc but not for 258! 
GL_ALPHA, // format
GL_FLOAT, // type
(GLvoid*)sourcePointer);



does not work!

The bug depends on the size of the texture update. using a power of two
for texture width and height will eliminate the bug, however this exactly 
is the reason we have to use glTexSubImage2D in updating tiles. 

Any hints and workaround is very much appreciated, as our application has to make
string use of the  glTexSubImage2D functionality. 

best regards

Heimo
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