I've edited CustomVis.xml and the Chat window doesn't get updated.
Example: You wanted to change the text "We're ready to chat! Please fill out the form.." to " Fill in the form ", you saved CustomVis.xml containing the new information, however when you click on the Chat button icon, the Chat window has the old values and text.
Open IIS, expand the Application pools, right click on SightMax3 Application Pools, then click on Recycle.
Your chat window should show the new information now.