I actually had a long conversation with some people about the different costs a traditional publisher has compared to self publishers.
Traditional publishers have a lot more fixed cost and those don't translate well to the costs a self-publisher faces. Rents, insurance, salaries, utilities, equipment, supplies, and services all have to be paid out every month. On top of royalties paid to authors. The cost of publishing a book (even an ebook) is significantly more for a traditional publisher and their book prices have to be higher to help offset those costs. Self-publishers (especially in Romance) have done a good job of lowering the expected list price of an ebook and increasing the marketing costs. For the small publishers who don't have a bestseller to make up the volume, they have to lower their profit margin to keep up with trends. Eventually, the margin slips from profit to loss.
In most cases, it's not embezzlement or incompetence, but the slow creep into debt caused by the current market, exponentially more costs as the company gets bigger, and fluctuating costs that are beyond their control. The company can't get out of the hole they suddenly find themselves at the bottom of.
I don't know the specifics of Dreamspinner, but it's frightening for both the authors and the publishers. And this isn't the first time it's happened. The past few years are littered with small publishers who disappeared. Some bowed out before they got to the point where they wouldn't be able to meet royalty payments, but some didn't. Part of the issue here is Dreamspinner not communicating with their authors and not addressing any of the concerns. All I've heard (and not saying this is small) is that Dreamspinner hasn't paid out royalties, but nothing about what they've said or even haven't said to authors.