Since the last update, the video settings on my client keep getting changed when I alt / tab out of the game or when I select back into the game. Some of the symptoms

missing art for jump point arrows. Just getting white flashing boxes -
Data gets lost to the left of the hud- can't see ship or group info
Data gets lost at the bottom of the hud and pda, can't get to keys without adjusting video setting.
Missing clock from tcs plugin both on the Hud & PDA

I'm on Windows 7 using DX 11

Unrelated but ice asteroids look like light bulbs fixing to burn out.

Edit: the missing arrows seems to have sorted itself out after a couple of restarts

The voclock feature in TCS is badly broken by anything that resizes/recreates the HUD. I'd recommend turning it off.

Ship & Group info is on the right by default. Does it fit on the screen without TargetLess?

Alt-tabbing shouldn't cause a screen resize though. What's your GPU?

I made a change in the new patch to try to deal with alt-tab issues on dx11. Hopefully it will fix your problem.