Spark and some other applications have problems with multi-monitor setup because of the bug in the latest Windows 7 security update (KB4034664). You can find more information and links to articles with bug explanation and workarounds at https://community.igniterealtime.org/thread/61111. As it is a bug in Windows, there is nothing wrong in Spark.
Microsoft has released a fix https://support.microsoft.com/en-us/help/4039884/windows-7-update-kb4039884.
Expiring the announcement will not delete it but will remove it from the public announcement list. Are you sure you want to expire this announcement?
Are you sure you want to delete this announcement?