I don't think that is the issue. It would have been on ex-date anyway and not the pay date.
Have been in and out of BX, SLRC, KFN, and APO. Sold my KFN last Friday for a nice profit, but noticed it took a big dive on Monday. (Just raising cash - no brilliant insights on my part.) All of the above also took hits. Besides being involved in fairly illiquid private markets, BX and APO have substantial realty groups, and I wonder if the fear is that they have some bad hedging trades on ala JP Morgan. APO knocked it out of the park and has a .25 divvy going ex on 5/17 and the stock is not moving. Even COF that does little hedging is getting hit.
Haven't read anything anywhere to indicate this, but the sweeping downdraft on financials makes me think it is a reaction to JPM. No one knows who is doing what from a hedging perspective. Doubt and no knowledge prompts sell orders.
I am underwater in BX and APO so I feel your pain. At this point I am looking for other places for this money.