To much humdity is the usual culprit. Crank down the humdifier-buy a chart that tells you what the relative interior humidity should be based on the outside temperature-38% at 4 degrees outside is way to much. You should probably be under 15% humidity at that temperature. Water Vapor can't pass through the glass so it's turning back into water on the glass. High performance Low "E" glass with argon gas is more resistant because it keeps the inner pane warmer than the outside pane. Condensation can also form when the glass is very cold and interior heat comes in contact with it. Even new windows can get it. It's not a defect in the window unless the weatherstripping is poor, or also the installation was not right (i.e. no insulation or caulking in the right places). Proper installation is also important, especially on tall windows where the frame sides might bow out if not shimmed or adjusted properly. Your excessive humidity coupled with an improper installation is the first place to check before going any further.
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