Login screen appears on wrong monitor

This problem started when I upgraded from Mavericks to Yosemite 10.10.2. It persists on 10.10.3
I have two monitors; the main one is 26", the other is 17". Both are NEC. The main monitor connects with a DVI-to-Mini display port adapter. The 2nd with a VGA to DVI adapter. Video card is the stock AMD 5770 with one DVI two mini display port connectors.
On startup, the Apple logo appears on my main monitor, as expected. Then the login screen comes up on the 2nd monitor. Once I'm logged in, the main monitor becomes the primary display again (according to my user account display preferences).
I've checked all the preferences, reset the NVram and the SMC, and tried plugging the the main monitor into the other display port. Nothing changes this.
It's not a big problem, but it's annoying.
Any thoughts?

You can change the arrangement of the displays, and assign a primary one in the Displays system preferences (done by dragging the menu bar to the preferred primary display). However, this will not change what display is identified first by your hardware. If you have FileVault enabled, then the login screen you see will be loaded before the operating system is loaded. This login screen simply mimics the OS X login screen, but is in fact stored elsewhere on your disk and used to unlock it. As a result, this login screen will be shown on the display that is identified as the primary one in hardware, and then when OS X loads this may switch depending on your settings in the Displays preferences. Your options here are to either move your monitors on your desk, swap their connections to your Mac, or adjust the primary one along with the arrangement of them in the Displays system preferences (or a combination of these three) to find a setup that works as you want.
1. When you initially boot and see the login screen, note the connection of this monitor to your Mac. This port is the primary one.
2. Connect this port to the display you want to be the primary one (to show your login window, etc.)
3. Once booted to OS X, go to the displays system preferences and ensure the menu bar icon is dragged to this monitor so OS X identifies it as the primary one.
4. Adjust your display's arrangement accordingly in these system preferences.

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