Same thing happens with me, and I understand that perhaps a work around is to move the "black" to "not-so-black", which is fine for a minor or short term workaround. But for a premium pay-to-play, this isn't acceptable.
I've tried everything listed in this forum and several others... black items don't stick. "It should work... " ... Well... it doesn't!!
I've tried it on two PCs as well think maybe the install was mucked up, but it doesn't matter. They both don't work.
I'm not trying to be combative, and I know with patches and upgrades, things happen, but if we don't respond with the issue, then no one will try to fix it.