I will let you know, though I'm not travelling until the end of the month. However, I just looked on the Holiday Inn website, and they show this:

What are qualifying room rates?
Qualifying room rates are applied when you book through IHG central reservation offices, IHG Web sites, travel agents or directly at the hotel. In North, South and Central America and the Caribbean, points may be awarded on locally negotiated rates if these rates are discounted less than 30%. At Asia Pacific hotels, qualifying room rates also include all locally negotiated rates.

I take this to mean that I'm still good with IHG at least.

If it were true that all hotels suddenly stopped giving points to travelers who booked through our company AMEX site, I would have heard about it. I probably did not hear about the BW change because I'm one of the few travelers in my company that was a regular BW user. All of my colleagues stay at other chains. Most of them think staying at BW is "slumming." Even my very frugal boss teases me about BW, though he appreciated the savings.