>Well, it appears I've found the problem. Our app has a fairly decent-sized SET PROC list. If I issue a SET PROCEDURE TO, then the chart will render within a second.
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>So, the $1,000,000 question is why would the SET PROC list have any negative impact on GDI+?
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>And the bonus question would be why this issue doesn't even show up when stepping through the debugger while the same SET PROC list is in effect.
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>Either way, I'm thrilled that I found the issue!

Personally I have changed my programming habit regarding SET PROC. Earlier I had one huge procedure file, plus a few smaller procedure files. Now I keep every single procedure and function in separate files, and make sure that they are in a directory which is in the path.