Again forgive me if I dupped this I saw this issue for the console editions an such..
Okay so I have been noticing that mine, versus my friends, is not spawning nearly as many mobs as hers. we are the same 1.9 pre release 2 etc etc normal difficulty and such. Even mine on hard spawns hardly any.
Even my cave spider spawner makes that flash animation like it spawned some but nothing appears like it's on peaceful or something and it's not. I have been standing next to it for 10 minutes and nothing. My cave spider spawner was working great up until I started lighting all of the cave around it. I will add more when I can!
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My render distance is at 7 chunks but I have a 9X9 dark room with a cave spider spawner that has been working very very well until I started exploring the rather large cave that I found it in. Now all of a sudden (because I lit up more of the cave) they stop spawning even when I am standing right next to it for 10 minutes I walked back an forth around it, nothing changed. It makes the animation that it is spawning them but I see nor hear anything. The room is pitch black. I don't know what to make of it 😞 I mean I always have noticed that I have less mobs spawning compared to my friend. It's bizarre.
EDIT: I went back to 16w06a and my cave spiders are spawning again. So it seems that this is definitely and issue with 1.9pre2. I do not know if this issue is the same as my lack of mobs compared to my friend's. For example: n normal hers were spawning so much that they spawning in her very lit house for some reason and mine I am lucky if I get any. Also I have noticed that hostile mobs despawn awfully quickly too maybe this has something to with them seemingly not spawning at all for me??
What do you have your render distance set to, in your video settings?