This question relates to a special case in which the Windows “Switch user” operation (a.k.a. “fast user switching”) was used and it kept both the old user and new user logged-in. By default, SoliCall Pro does not handle this scenario because SoliCall Pro is a special application that is connected to the virtual audio device driver and therefore only one instance of SoliCall Pro can be simultaneously executed on a single computer. We recommend to avoid such cases by simply using the Windows operation “Log Off” before a new user logs-in. If this is not possible in your organization and you need to allow using “fast user switching” then please contact us to provide you with our solution.