Well, the official SDK is OABI, and I think that the pro has a different SDK. In fact, what I suspect is that they did this chroot kludge to keep binary compatibility with the older models, and to include some EABI software at the same time. Anyway, probably, they just forgot that this breaks the functionality provided by netagent to custom apps. I don't think that any other model is affected except PB360+, and possibly not all of them. This is a minor issue, but I may send them a bug report, just in case. Thank you for the info, anyway!