Anne, thanks for your input.
The XL Toolbox uses functions built into Windows in conjunction with something called FreeImage to produce the high-resolution graphics. This has not changed between the ‘legacy’ versions (up to 6.60) and the ‘Next Generation’ versions (7.0 and up). What did change was the programming language of the XL Toolbox: It used to be Visual Basic for Applications, and now it is the state-of-the-art .NET technology (C#).
So, in theory, because the underlying technology is the same, the graphics should look the same whether they have been produced with the legacy Toolbox or the Next Generation.
Having said that, I have received a similar comment from a user a little while ago. Unfortunately, for me the graphics look fine, which makes me wonder whether there are issues pertinent to the specific version Windows that Excel and the Toolbox are installed on.
My primary use case is to produce print-quality graphics, where smoothing is not desired. In fact, I am a little worried because currently all of the graphics exported with the XL Toolbox are smoothed (zoom in to see). After playing with the code a little tonight, I think I have found a way to obtain graphics that are not smoothed at all, and this technique might lead to some sort of user preference setting for the XL Toolbox.
If you want to send me an example graphic that you are not happy with, you can send me a private message by clicking on my user name in the forum. I could then have a look at it.