...What I want is this: The first thing I do is open my Gmail. That is my only window ever. Anything I click in my emails will open into a tab next to my Gmail and so on. And I have the + sign to the right of the last tab opened. If I want a new window all I did was hold down the Ctrl button as I clicked on the link. (I am running Windows 7)...
First, make sure you have the latest TMP version installed. Restore the default settings: Settings > Restore default > Apply.
2. Go to Events/New Tabs and check Open other tabs next to current one + Only if related to current tab: http://tmp.garyr.net/help/#Events_-_New_Tabs
3. Display/Tab Bar > check New tab button > After last tab: http://tmp.garyr.net/help/#Display_-_Tab_bar
If you don't see this button (New tab button, looks like a plus sign), Right click on any toolbar/Customize... and drag out of the Customize window on to the tabbar.