A/C fuel usage imbalance after FS9 move to new computer

Recently got a new computer with Windows 7 and did a clean install of FS9. Then I moved my FS from the old computer's drive into my new one. There were a few quirks and glitches I had to iron out, and I have got it almost running as before except for one minor glitch....when flying the default 737-400 the aircraft uses fuel from the right tank at a much faster rate than from the left. Does anyone know the setting that may have been altered to cause this? tia.