Cannot change from Webstat to AWstat

[Webroy]

HI ,

Plesk 10.4.4 latest update Centos 5.7

I have a problem.

I want to change the domain statistics from webalizer to awstats. but he doenst change it. He goes to please wait en thats it.

I tried :
webalizer to webstat
webalizer to none

No change are made...

I have tried several domains...