I'm pretty curious, how does EN DWO run into these types of problems when it seems like JP server doesn't have them, and if JP does, why can't EN get the same patch (or similar) they used?
I think this has been said a lot of times before, but aeria only has a license to publish the game, not modify it significantly, even for that game breaking bug.
They have to communicate with KOEI to get bugs fixed. That and how Tyrael explained it, I'm pretty sure that this game is low on Aeria's priority list.
Think of it like this: You want to make money and you have several products that are doing so. Let's 3: A, B and C. A and B don't make up a lot of your income, but C is taking off like mad. As a business decision, it would be wise to prioritize C, since many people will be using that. Anything to fix C will be done in about a millisecond. A and B however could take about a week or a month to fix, because they aren't as popular than C.
But that's just one thing. Here, we can only blame Tecmo Koei for not sending a bug fix. It's kind of hard to guess what both companies are thinking, since we're dealing with them both. Maybe DWO doesn't bring in a lot of income for TK, so they'll get to it once they can. The same can be literally said for Aeria. They'll communicate when they got spare time. That's quite cynical of me, but seeing as how DWO is doing, it's probably a safe bet tp say they'll get to it eventually.
This is all assuming Tyrael is right and DWO is one of the products that isn't bringing in too much cash as the products aeria provides.