[Cymen]

The only way I can keep my MBP retina happy when using it with an external Thunderbolt display is:

1) before plugging into display, open lid and wait for login screen to appear

2) before unplugging display, open lid and wait for laptop screen to turn on (normally I keep my laptop closed when connected to the display)

If I deviate from this the laptop crashes or goes into some odd state.

[atonse]

I do EXACTLY this to avoid my laptop acting weird when I take it home/bring it to work.

[ChikkaChiChi]

I've had this same problem on more than one Macbook at work.