Hi Sergey,
The imagefile field did not look corrupted in the way I expected - i.e. containing nonprintable characters. The records for the classes having the wrong icon contained either existing network paths with no file name, or a path + a non-existing bmp file name (the bmp file name was the name of the class).
Before changing them I tried refreshing the category, but that did not change the imagefile field. I've manually changed the imagefile, and it works ok now, but I'm still a little worried, especially because I suspect some C0...5 I've got in the past were related to the use of toolbox.
Thanks!

>Hi Doru,
>
>It's possible that Toolbox.dbf got corrupted. It's located in the HOME(7) directory. You can open it and check Imagefile field for icon (bmp) for the classes in question. The name of the file for thextbox, for example, should be 'textbox.bmp'.

USE (HOME(7) + "Toolbox") AGAIN
>BROWSE LAST
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>>When I added our class library containing subclasses of all VFP base classes to the VFP Toolbox, most of the classes show the correct icon on the left.
>>The command button, the separator, and the activedoc classes show the toolbox icon (the wrench & hammer cross)
>>Because of this, they are harder to spot, but I wonder if this is a sign that there is something wrong with these classes?