Weird IVA glitching with 6DOF device when USI Tools are installed

[Hupf]

I recently bought a SpaceMouse Pro from 3dconnexion and got it to work. In my regular, heavily modded game, I then noticed a new bug that wasn't there before: when switching to IVA, the camera would be rotated 180° on the "pitch" axis, i.e. I would look at an upside down green kerbal face and the backside of the cockpit at hand (chairs etc). I could rotate from there with the SpaceMouse just fine, but the center would be this view and since rotation is limited to half a sphere, It wasn't very practical for flying vessels.

After looking out of the window when on the ground, I also noticed that indeed the camera was fine, but the cockpit itself would be "upside down" i.e. point in the wrong direction when in IVA. On the external view, the cockpit is pointing "up". When switching to IVA, the camera is looking towards the sky. However the cockpit is not oriented towards the ground. Switching back to external view and everything is back to normal.

So, then I did a bisection of all the installed mods to find out the one(s) responsible and I can reproduce the issue (or a very similar one) if all of the following conditions are met:

• @RoverDudes USI Tools mod is installed (on a fresh game from source https://github.com/BobPalmer/UmbraSpaceIndustries/releases/tag/0.7.4.0)
• The SpaceMouse is plugged in
• Prior to switching to IVA, I wiggle it around a bit to change the viewing angle on the exterior view.

Steps to reproduce:

1. Start new sandbox save
2. create vessel with Mk1-2 command pod, small fuel tank and skipper engine
3. launch
4. use SpaceMouse to change viewport (rotate + zoom + translate)
5. enter IVA (either by Keyboard "c" or by "View" on a protrait)
6. observe the view outside the window being tiltet

Logs: http://www.file-upload.net/download-11823738/kspspacemousebuglogs.7z.html

(note: I did enter the "Fly" mode twice because on the first attempt, I skipped step 4 and the IVA seemed correct then)

Video to show the effect:

(note: The bug is visible from 1:34 on. Also this is a slightly different effect than on my fully modded install: the ground is only tiltet and not completely flipped around. I wasn't able to reproduce the full 180° initial rotation yet)

System details:

• KSP 1.1.3 x64 (Steam)
• 3DxSoftware (64-bit Edition) 3.18.0
• Windows 10 Pro x64 Version 1511
• Intel HD Graphics 5500, Driver version 20.19.15.4300

Edited August 4, 2016 by Hupf
forgot system details