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So in order to change it I have to actually change the color.....too bad certain colors generate them.
FWIW, the reason is because the basic 5250 data stream has only one byte for the display attribute. On monochrome displays, the bits are for column separators, blinking, underlines, high intensity and reverse image, plus 3 bits that are always 001 to indicate that it's an attribute.
When they added color support, they reused this same byte, but had it indicate colors. The bits that indicate yellow happen to also indicate column separators.
Later they added extended attribute support, but not all terminals support it, so the basic attribute byte is still the primary one in use for everything.
It's one of the many limitations of the 5250 protocol.
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