I added an image field into the table, then choose 150px as picture width, but the picture is not shown.

There is only a placeholder with the following url shown in its preferences:

 http://www.if-then-else.org/DesktopModules/UserDefinedTable/MakeThumbnail.aspx?image=%2fPortals%2f1%2fBilder%2fAvatar.jpg&w=150

The MakeThumbnail.aspx file exists, but I have no idea how this is supposed to work. This file only contains one line, but no code.
Is there any documentation available on that file?

In addition:
My pictures are stored within an upload folder, where a special group has edit rights and 'all users' can view the content.

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www.if-then-else.org

The issue with the pictures, which are not shown only seems to be kind of colateral damage.
Because I also have the problem that I have an URL field and when I try to select "File (A File on your site)" instead of "Url" I'll get an error like:

A critical error has occurred.
String cannot be of zero length. Parameter name: oldValue

Is it possible that the control tries to get some oldValue like an history Value? But the file could be missing, because I imported the contents of this DNN-portal.
If this could be the reason do you have a clue, where in the database this oldValue/history thing is stored?

Or do you have any further suggestions?

Thanks a lot.

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www.if-then-else.org