Hey

Unfortunately, without screenshots/video of your initiative hitting 0, it's hard for us to assess the situation.


For the meanwhile, clear your cookies/cache and restart your client.
If the problem does occur again, don't restart your client, check your initiative stats to see if there's a bug displaying it's number value.

http://rs934.pbsrc.com/albums/ad188/Gaara_Anime_Freak/kakashi_thumbs_up.jpg~c200