Unfortunately I have no idea what's going on. Neither Iris or I can come up with any logical reason why you two would both be having so many problems with the last couple of versions, while they have worked for you two in the past.
Do any other games on your computers have any issues, or are there any other odd behaviours on your computers at all? There isn't any reason why our game in particular should have problems, assuming your drivers and directX are up to date, you meet the system requirements, and your Windows installation is not corrupt or something.
You're welcome to wait and see how v0.25 works on your computers, but it will include the same .dll files as the previous versions so I don't see why it would work any differently.
Would you be interested in me posting a much older version, say 0.19 or something like that, to test? Just to see what happens? In theory though, it should work exactly the same as v0.23.