Yamaha n8 and Cubase Studio 4

Hello fellow Cubase Users… Firstly - Happy New Year to all… Have a problem and need my fellow Cubase advisers…

My Current setup is 2 Yamaha n8’s and was contemplating getting a MR816csx… Now, after contemplating my needs for extra “Mixing” channels seeing that I don’t really need more preamps, I eventually opted for another Yamaha N8. Ordered from sweetwater yesterday… In my country the exchange rate is 6 to 1 US dollar… “So Price was also an issue”…
Anyways, Since Last saturday, I did a mix on a song, and LOVED the Mix… I mean “to me at least” it was one of the best mixes I did on the Yamaha’s… I do my own mastering as well… “It came out great” "Mix/Master with Cubase Studio 4 & Yamaha Mixers + UAD Plugins…

Yamaha FW Driver 1.2.0 x64 - VISTA x64
Extentions- x32
Cubase Studio 4
2 Yamaha n8’s (going to add a 3rd)
Gigabyte EX58-UD3r Motherboard
i7 920 - not overclocked
Corsair ddr3 XMS Platinum series ram
Super beefy Thermaltake 750 Powersupply
(This combo works for me)

On Sunday, made the decision to opt for my 3rd Yamaha n8 + made some changes to the studio. Moved around some stuff + Redesigning the studio = But left the two mixers IN PLACE… All settings and everything were set since saturday. + One Change though…---- Removed a LYNX TWO A PCI card from my computer as this was my previous system before the mixers…
Now After setting back up everything and having made the extra space for the third mixer – Decided to re-load he song from saturday and all of a sudden, the VST Performance meter is “CONSTANTLY SPIKING” Whereas the saturday before while recording the SAME song, the VST Meter was reading about less than half - which is not much…
This baffled me to say that least, seeing that all I did, as far as the computer is concerned, is removed my previous Lynx Card… So I said OK, Let me go an uninstall the Lynx drivers manually. Did that – Went into the registry — removed everything “LYNX” that I could find — Removed all directories that the Uninstallation left back… Reloaded Cubase Studio 4 and the song — SPIKES, SPIKES and more SPIKES…

Being seriously Confused by this, I Decided to Uninstall the Yamaha drivers and opted to try the NEW yamaha 1.6.0 Drivers… "Now remember I’m using VISTA x64 bit. " I tried the same configuration as the last driver – x64 bit driver – x32 bit extensions — come to find out that the 32 bit extentions WON’T install in Vista x64 bit… So I said, ok… Guess I have to try the x64 bit extensions— So I Did… Sweet spot data manager soon followed ----Realized a NEW development that the HARDWARE MIX button would NOT activate when I press it… (The Cubase LIGHT was still on though) Still decided to reloaded the song in Cubase again ---- AND SPIKES SPIKES (and this time) - WORST SPIKES THAN BEFORE… and just to be sure, i Tried different songs with LESS plugins and got the SAME result…

So… Being real frustrated by now (Since I’ve had stability with both mixers since the 1.2.0 driver came out ) I went ahead and tried different things

  1. Unistalled 1.6.0 drivers again (and I removed everything from the
    registry and all directories and stuff-- sort of a common practice for
    me when uninstalling)-- reinstalled 1.2.0 drivers…— SAME
    PROBLEM …

  2. Decided to put back my lynx two card – (which probably was a stupid
    thing to do) but i wanted to try everything I could think of and -----
    It made absouletly NO Difference – which was to be expected…

  3. Took back out the Lynx two card - re-tried the 1.6.0 drivers again –
    Same result…

  4. Uninstalled -1.6.0 drivers and reinstalled 1.2.0 drivers — SAME
    RESULT

  5. Decided to look on the Net for Help – Found on a cubase forum that
    a DEFAULTS.XML file that houses preferences for cubase could
    sometimes get “corrupted” and cause spikes – so I hunted this file
    down In "Users/Name/Appdata/Roaming/Steinberg/Cubase
    studio 4/defaults.xml---- and erased it… Reloaded cubase
    and got the Hardware Mix button back to work but still Spikes,
    Spikes and More Spikes…

  6. Then I decided to Add a PCI firewire – (Texas Instruments
    chipset) — Same Result – Been using the Firewire port on my
    board ever since with the same chipset…

  7. Took out firewire card — Reinstalled Cubase — and Changed
    firewire cable – and reinstalled 1.2.0 drivers AGAIN – Reloaded the
    song and BINGO ----
    NO SPIKES — BACK to NORMAL – Back to Happy days for me…

    or so I thought…

Finally i Decided that I wanted to change a Particular part in the same Song that I had mixed the saturday before… (So Please note that the ASIO Spikes are Gone and The VST Meter is back to normal)… Now I had the song running in Cubase Studio 4 – I Changed a piece of instrumentation(everything good so far) — Recorded the mixdown wav file — (Still good so far) – Went back into the already saved file I had with my mastering settings (cause I master with Cubase) — Again all my settings were stored in that file with regards to Plugins = eq - comps - limiters and what not ---- Finally recorded my Mastered wav file ---- Played it back and all of a sudden - My New Master file sounds WEAKER that my original Master file back from Saturday … What the ???..

With all my settings reading exactly the same — The sound is Lower - less punchy and stereo imaging is narrower… Huh??? I can’t figure out what happened…

So my question is – Has anyone had a problem like this where a complete mixdown was done — (You stored all your settings both on the Mixer and in Cubase obviously) – went back to the same song days/weeks/months later and found that the sound was different???

PS: This has happend to me on two occasions before with two different songs…

PS: Yea I know this is REAL LONG - but sorry I tried to explain this a clearly as I could— Any response would be greatly appreciated…