The version is 2.6.3, and the problem is that usually I type the message to somebody and press enter, but the message doesn’t leave the typebox and doesn’t appears on the top chatbox. Then we keep pressing enter to send it, and apparently does not. Later, we have noticed that the destinatary user, receives a lot of messages.
I dont think so man, we have no firewall enabled, our antivirus has exceptions for all default programs we install on the pcs, including spark. And we have adminstrator permissions to the users folder.