The default for text fields is to have black backgrounds. At least, that is what you get when using the MacOS WebKit in an app compiled with the 10.5 SDK. The reason is that by default the background color is set to clearColor, while the drawsBackground flag is set to YES. When developing with the 10.5 SDK, this is rendered as black. Clear color is wrong, it should be white by default.
This sounds a much like 86266. Could you please confirm that this is a duplicate, or provide more information of how to reproduce?
Yes, this looks like a duplicate of 86266. Though I don't see the real reason for the bug described in that bug thread, and I am pretty sure that the patch described there fixes it.
Thank you, let's mark it as duplicate then. *** This bug has been marked as a duplicate of bug 86266 ***