I was experiencing the same issue where my video apps (Windows Movie Maker, Pinnacle Studio 11 Ultimate, and Magix Movie Edit Pro 12) would control my JVC GR-D72U camcorder, but not capture any video. I'm running Windows XP SP2 (also experienced the same problem on 32-bit Vista Ultimate). I resolved the issue by replacing my non-TI FireWire adapter with a SIIG Inc., FireWire 3-Port PCI adapter with a Texas Instruments (TI) chipset. The key is using a TI-based Firewire adapter. Everything works great now. Needless to say I'm very happy!! Hope this helps you.

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