[galaxy-dev] I can't impersonate an user

Dear all, We are currently using the stable build of Galaxy and we are encountering the following problem: When we try to impersonate an user, the user drop down menu hangs in looking up the user. In consequence, we can not impersonate the user. This behaviour started when we upgraded to the Feb 10, 2014 version. Do we have to modify a configuration file to make this to work again? Thank you all, --Ricardo Perez