OK, I removed and reinstalled Advanced Interface Switcher and now that auto dialog pull up works again. No need to disable HWsync.

EDIT: Ah, scratch that. After rebooting, it doesn't work again. Something must be blocking the calling script (you know, that internet connection is automatically pulled up after you enable wifi...). I just applied this patch and swappolube proposed settings. HWsync is disabled now but still doesn't help.