export - Mathematica not exporting gifs properly -

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i'm trying export image .gif file in mathematica (version 7). let's take basic example:

export["pic.gif",graphics[{circle[]}]]

there no error messages, , pic.gif file in fact created, file's totally blank; 4 kb size, 0x0 dimensions, if open file no window appears.

i've tried messing format, such as

export["pic.gif",graphics[{circle[]}],"gif"]

and

export["pic.gif",graphics[{circle[]}],"image"]

but no avail. export works other file-types (tried .jpg , .png no trouble), i'm not sure problem is.

version 7 several years old on version 9.01 (the newest) mac os x works fine yehuda


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