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In options menu Appearance->Document Tabs, you have the option to do "One row per project." This works great every time a file is opened from a different project. But, if I have multiple tabs for multiple projects and I quit that instance of NetBeans, the next time I run NetBeans all the tabs I previously had open are no longer separated by project. The tabs should continue to be separated by project on every run of NetBeans.
Here is my environment information from the About window: Product Version: NetBeans IDE 8.1 (Build 201510222201) Java: 1.7.0_91; OpenJDK 64-Bit Server VM 24.91-b01 Runtime: OpenJDK Runtime Environment 1.7.0_91-b02 System: Linux version 3.13.0-71-generic running on amd64; UTF-8; en_US (nb)