Kerbal Space Program

Summary: if the Interior Overlay is on when the player goes to full IVA view, the Interior Overlay will activate on it's own every time the player goes to map view and back.

Reproduction: activate Interior Overlay View by clicking on button next to Kerbal portraits, then press C to go to full IVA, press C again to return to external view. Turn off Interior Overlay View, press M to go to Map view, and press M again to switch back. The Interior Overlay View is back on. It will reactivate on it's own every subsequent time the player goes to map view and back.

I was able to reproduce this behavior with the Mk3-1 by simply placing it on the launchpad. I then tested it with the DLC Mk2 (Gemini) pod, then the Mk1 pod, then the Hitchhiker pod; all had the same behavior. I unzipped a clean v1.4.1 64-bit install without the DLC installed, went straight to the VAB, and placed a Mk3-1 on the launch pad, and same behavior.

The above paragraph indicates to me that this bug is most likely affecting all IVA's of both core game and DLC crewed parts (I only tested a few crewed parts, not all); and is within the 1.4.1 core game itself, since it was reproducable in a clean 1.4.1 install without the DLC.