Just to throw my 2 cents into the unified conversation here.

I tested all of this as follows:

1. CLEAN install.  Uninstalled 1.0, deleted any remaining files I found (including saved flights), then re-installed.
2. I loaded the Cold & Dark flight from within FSX.
3. I began the checklist at that point.  I did not go into any menus, did not change the aircraft, did not use Shift+Z to clear the sim info.  I only used Shift+A to move around the flight deck and +/- to zoom in/out.

(* = OK, X = discrepancy from checklist, @ = doesn't make sense to me)

* BATTERY switch - Guard closed
@ DC Meters - on BAT, positive indication on DC Amps
* AC Meters - on APU, Flat
* GALLEY POWER switch - ON
* STANDBY POWER switch - Guard closed
X STANDBY PWR OFF light IS ON
* BUS TRANSFER switch - Guard closed
X TRANSFER BUS OFF light IS ON
X BUS OFF light IS ON
* APU - Start
* APU GENERATOR switches - ON
* BUS OFF lights - extinguished
* TRANSFER BUS OFF lights - extinguished
* LOW OIL QUANTITY light - extinguished
* APU LOW OIL PRESSURE light - extinguished
* APU HIGH OIL TEMPERATURE light - extinguished
* APU OVERSPEED light - extinguished
* AC Meters - on APU, power indicated.
@ DC Meters - on BAT, negative indication shown on DC Amps.
* DC Meters - on STDBY PWR, indications correct.
* AC Meters - on STDBY PWR, indications correct.
* STDBY PWR OFF light - extinguished at this point.

From here, I did the following (I know, it deviates from the checklist)...

WINDOW HEAT - All ON
PITOT STATIC HEAT - Both ON
ENGINE HYDRAULIC PUMPS - OFF
ELECTRIC HYDRAULIC PUMPS - ON
APU BLEED AIR - ON
ENGINE BLEED AIR - Both ON
Left AC PACK - ON
Right AC PACK - ON

NAV1 is already tuned to the SEA VOR.  In this condition, the avionics will fail in about 8 minutes on my machine.  The overhead electrical panel will not change in anyway.  APU is running and indicates power, STDBY PWR indications are correct, BAT will continue to should a negative indication on DC Amps.  Engines will not start.

If I turn off the APU, that's all she wrote.  Nothing in the aircraft will work.

Note: This applies to ground power as well (for me anyway).  If you skip all of the APU items and only use ground power, you will see the same electrical indications and the avionics will fail in the same amount of time.

UPDATE: I verified that under both APU and ground power, leaving window heat, pitot static heat, the electric hydraulic pumps and a single AC pack OFF still results in a failure, but it takes longer.  Roughly 12-15 minutes instead of 6-8 minutes.  Less power drain, I guess.  So, following the checklist to the letter does not resolve the issue.

My original posts are here and all deal with the 1.0 version...http://www.captainsim.org/yabb2/YaBB.pl?num=1335135522