13:58:26.359 [log.header]: Opening log for Oolite development version 1.75.4.4633 (x86-32 test release) under Windows at 2011-10-30 13:58:26 -0500.
4 processors detected.
Build options: spoken messages, mass/fuel pricing, JavaScript console support, OXP verifier, localization tools, debug GraphViz support, JavaScript profiling.
13:58:26.609 [rendering.opengl.version]: OpenGL renderer version: 3.3.0 ("3.3.0"). Vendor: "NVIDIA Corporation". Renderer: "GeForce GTS 250/PCI/SSE2".
Exception: TypeError: ship.scriptInfo is undefined
Active script: NPC-shields 1.0
script.js, line 55:
if(ship.isSubEntity || ship.isStation || ship.isThargoid || ship.isRock || ship.isCargo || ship.isWeapon || ship.isDerelict || ship.primaryRole === "wreckage" || ship.scanClass === "CLASS_BUOY" || (ship.scriptInfo.npc_shields && ship.scriptInfo.npc_shields === "no")) return;
16:23:03.437 [log.header]: Opening log for Oolite development version 1.75.4.4633 (x86-32 test release) under Windows at 2011-10-30 16:23:03 -0500.
16:23:30.265 [script.javaScript.exception.unexpectedType]: ***** JavaScript exception (snoopers_modelview 2.1.2): TypeError: ship.script is undefined
16:23:30.265 [script.javaScript.stackTrace]: 0 (snoopers_modelview.js:54) <anonymous function>
16:23:30.265 [script.javaScript.stackTrace]: this: [Script "snoopers_modelview" version 2.1.2]
16:23:56.625 [script.javaScript.exception.unexpectedType]: ***** JavaScript exception (oolite-default-ship-script 1.75.4): TypeError: ship.script is undefined
16:24:09.093 [script.javaScript.exception.unexpectedType]: ***** JavaScript exception (oolite-default-ship-script 1.75.4): TypeError: ship.script is undefined
16:24:09.562 [script.javaScript.exception.unexpectedType]: ***** JavaScript exception (oolite-default-ship-script 1.75.4): TypeError: ship.script.shieldStrength is undefined
16:24:10.062 [script.javaScript.exception.unexpectedType]: ***** JavaScript exception (oolite-default-ship-script 1.75.4): TypeError: ship.script.shieldStrength is undefined
16:24:10.562 [script.javaScript.exception.unexpectedType]: ***** JavaScript exception (oolite-default-ship-script 1.75.4): TypeError: ship.script.shieldStrength is undefined
16:24:11.062 [script.javaScript.exception.unexpectedType]: ***** JavaScript exception (oolite-default-ship-script 1.75.4): TypeError: ship.script.shieldStrength is undefined
16:24:17.062 [script.javaScript.exception.unexpectedType]: ***** JavaScript exception (oolite-default-ship-script 1.75.4): TypeError: ship.script is undefined
16:24:27.281 [script.javaScript.exception.unexpectedType]: ***** JavaScript exception (oolite-default-ship-script 1.75.4): TypeError: ship.script is undefined
16:24:27.453 [script.javaScript.exception.unexpectedType]: ***** JavaScript exception (oolite-default-ship-script 1.75.4): TypeError: ship.script.shieldStrength is undefined
16:24:33.921 [script.javaScript.exception.unexpectedType]: ***** JavaScript exception (oolite-default-ship-script 1.75.4): TypeError: ship.script is undefined
16:24:44.593 [script.javaScript.exception.unexpectedType]: ***** JavaScript exception (oolite-default-ship-script 1.75.4): TypeError: ship.script is undefined
16:25:03.812 [script.javaScript.exception.unexpectedType]: ***** JavaScript exception (oolite-default-ship-script 1.75.4): TypeError: ship.script is undefined
16:25:12.984 [script.javaScript.exception.unexpectedType]: ***** JavaScript exception (oolite-default-ship-script 1.75.4): TypeError: ship.script is undefined
I uninstalled build 4633 and reinstalled 4630...and do not get these ship.script errors on it!
I wish I knew more, but I'll have to do an immense amount of OXP testing to determine if they're to blame.

The most recent Snoopers, boomberg markets, npc shields OXPs seem to be the ones that "complain" the most.

In debug console, I get this:
> player.ship.target.scriptInfo
{
callObjC: function () {
throw Error("callObjC() is disabled.");
}
}
> ship.script
Exception: ReferenceError: ship is not defined
Active script: oolite-debug-console 1.75
oolite-debug-console.js, line 823:
}
Connection closed with no message.
If anyone else runs the latest nightly build, can you confirm if these or similar errors appear in your latest.log?