Windows 10: Desktop moved from primary to secondary monitor (by a ghost??)

I have a Gigabyte P27 laptop with a Dell U2913WM monitor attached via VGA connector and a Samsung TV connected via HDMI.
I use extended desktop and the Dell is set as Main Display. The built in monitor is disabled.
The configuration is, from left to right, Dell (3), TV (2), Built in (1).
I been running this way for about a year with no issues until two days ago when all of a sudden after boot up the desktop had disappeared from the Dell and appeared on the Samsung. But the taskbar stayed on the Dell.
I dragged and dropped the stray icons back to the Dell and all was fine until the next restart when they moved back to the TV.
I have since discovered that any screen refresh causes the same phenomenon.
I've hunted high and low but I can find nothing that would explain this or suggest how to fix it.
Any help or info would be greatly appreciated.

:)

 

Windows & desktop icons on secondary monitor are moved to primary monitor after standby

I had been using 2 monitors with the same resolution (1280x1024) without issues. I recently replaced my primary monitor with a 1920x1080 monitor. Every time the system wakes up from standby everything from the secondary monitor is moved to the primary monitor.
Strangely enough, the desktop icons and the windows (explorer & applications) are not always moved.

I have already tried to delete corrupted registry entries as stated in
this thread. There were 3 monitors listed with different resolutions. That did nothing.

System specs:

OS: Windows 7 pro (64-bit)

Video card: AMD R7 260X

primary monitor cable: DVI

secondary monitor cable: DVI output -> VGA adaptor

 

The taskbar locked to bottom of secondary monitor moves to the primary monitor whenever primary monitor is switched on.

See the title.

I have the taskbar locked at the bottom of the secondary monitor so the primary monitor is completely empty for watching movies, games TV etc.

Whenever I turn the primary monitor on, the taskbar immediately jumps from the bottom of the seconday monitor over to the bottom of the primary monitor. I then need to untick the 'Locked' option on the taskbar, drag it back to the secondary and tick 'Locked'
again.

The taskbar disrupts desktop icons on the primary and any application running on the primary monitor at the time and quite frustrating.

Primary monitor is an Asus PB328, connected via Display Port to the PC.

Secondary monitor is a Samsung 24 connected via DVI to the PC.

I expect the taskbar to remain where I place it when locked, regardless of monitors been switched on or off.

The sequence of turning on the primary and secondary monitors has no impact. As soon as the primary monitor (Asus on DP) is turned on, the locked taskbar moves to the primary display, regardless of whether the Samsung is on or not.

 

I want to move spell checker window to a non primary monitor

I use my Internet Explorer on my secondary window. I have a misspelled word, I right click, the window with suggestions add to dictionary, is on the primary window. I don't want that. If I change primary and secondary windows, I can't move my mouse left
to right, its stops at the new secondary window.

I want to move the suggested spelling window to the secondary monitor.