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Thats just because you have black text on a black background. If you go into your signature and remove the text colour formatting it will change to the default font colour for the theme allowing you to see it on all themes ^-^
If you go into the non-rich text editor (click the A/A in the corner of the sig box), you'll see the bbcode. Just remove all the color=#000000 tags in the sig and you'll be fine.
No need to freak out though...it's an easy fix. Deep breaths. Relax.
Uh, no. You did. You had some red tags thrown in there too, but they were hidden by the black. This is why most people don't use colors and most disable post formatting. It clashes with styles.
Must've been. Staff don't randomly decide to go into peoples' signatures and make their text a different color. The only reason you noticed the change now is because the style you were using before was likely using black text (or a close enough color to it) as its font color.
You did put them in there, you just didn't know you were putting them in there because you were probably previously using the WYSIWYG mode for the signature editor, which shows you the changes as you're making them, and you set the text color in there to black. The WYSIWYG mode for the signature editor usually causes problems with colors for users who try to type BBCode or CSS into their signatures.