With yesterday's changes, the unmanaged debugging API has changed. If you're embedding Mono and want to initialize the debugging API, you only need to call mono_debug_init () - the old mono_debug_init_1() etc. hacks are now all gone (caution: do not call mono_debug_init_corlib()).
mono_debug_init() needs to be called before the first appdomain is created - after that, everything will go automatically.