I've done some more investigation about this error. Please let me know what sound devices are plugged into your computer when this error happens. For example “Focusrite Scarlett 2i2 USB recording interface”.
It would also be useful to see the jammr log file. Start jammr and go to Help | Show log. Please post the contents of the log.
If you are a technical user, maybe you can help provide the following information:
Open a Command Prompt (Start | Run… | cmd) and go to the jammr installation directory (cd AppData\Local\jammr). Save the stderr log to a file like this: jammr.exe >stderr.txt 2>&1. This will launch jammr and create a file called stderr.txt with low-level audio logs. Please post the contents of the log.
If you are a software developer, perhaps you can do the following:
Microsoft has a utility called KsStudio that can be used to show details of audio devices and drivers. This is a developer tool:http://msdn.microsoft.com/en-us/library/windows/hardware/ff537501%28v=vs.85%29.aspx
Find the device topology filter in the left pane of KsStudio, then drag-drop the list entry to the center window, right click on the filter instance in the center window and select “Show nodes” (or similar). That will expand the topology filter so that all nodes are viewable.