Sorry I haven't been here to help for a while, let's see if we can get this all cleared up
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@lokken: Just to be absolutely sure, you are running the latest version of AMX Mod X right? Your problem is really confusing me the most, but I believe it might have something to do with the cl_minmodels clientside cvar. I believe that if this is set to anything other than 0, you are unable to view custom models on players, but I'm not absolutely sure. Try setting it to 0 and testing out chickenmod: rebirth again, if you would.
@patryk: The problems you are having aren't with chickenmod: rebirth. The reason ATAC doesn't work properly is because it is set to use the old module version of chickenmod, which is slightly different from the plugin version. The solution would be to edit the amx_atac.sma and change the line
Code:
server_cmd("c_chicken # %i", player)
to
Code:
server_cmd("c_chicken #%i", get_user_userid(player))
as T(+)rget suggested above. The same change would be necessary for the c_unchicken command.
For your model problem, it seems that you are running another plugin that resets a users model every round. Chickenmod: rebirth will ONLY change a user's model once, so another plugin can overwrite this change. Since the player still functions like a chicken, but doesn't always look like one, I believe that is the problem in this situation.