I think you are safe using IFOUpdate or IFOEdit for correcting VTS Sectors -- but not running IFOEDit after IFOUpdate does an update from newly authored to original IFO. IFOUpdate can leave "dead" space when moving smaller tables into larger space in ther original IFO (reaching across 2048 byte boundaries). There are times when IFOEdit sees that and trys to fix the pointers, but does so incorrectly. If you search the forum you'll find some discussions on it.
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