Okay, so I'm not crazy. I'm not quite in the same spot as you, but it varies. I don't double-click the style box, I just single-click it, and the app freezes. If I ALT>TAB, I don't see the style dialogue, but I have occasionally. Even in these instances, I haven't been able to ALT>TAB the dialog box into the foreground. I suspect that it's just re-a-a-al-l-ly slow, and if I wait long enough, like hours, it might work the same for me. I cannot drag the primary window, sized or not. I haven't been able to try this on subsequent clicks of the style box, because I can only Ctrl-Alt-Delete and never get a chance to try the style box twice. I do get the same brief message saying "Initializing accompaniment functions... Please wait...".

I'm wondering if bbw2.exe is conflicting with something else running.

Band-in-a-Box® for Windows
Version 2025 (1128)
64 bit application
RealBand 2025 (5)
Windows 10 Pro 64-bit
Intel Core i7 4800MQ @ 2.70GHz
Haswell 22nm Technology
16.0GB Dual-Channel DDR3 @ 798MHz (11-11-11-28)