After upgrading my Mac from OS X 10.6.8 Snow Leopard to OS X 10.7.3 Lion, I discovered I could no longer write files to external NTFS-formatted drives. The problem is MacFUSE which, I found out, does not support the new 64-bit kernel. If this is happening to you, you must remove the old MacFUSE and install the newer version, which does support the 64-bit kernel. Here's how.
After upgrading my Mac to Lion, I discovered I was no longer able to write files to external NTFS-formatted drives, such as my backup Drobo.
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