L&T has some problems. I have 8 memory cards, 3 of which can be seen by L&T the rest give the error you reported. Of the 8 there are 4 different brands; Kensington(5), Transcend(1), Patriot(1) and Sandisk(1). 2 Kensington and 1 transcend card are functional with L&T.
What I haven’t done yet is format all the non-working cards and then try getting them to work. I have tried copying the contents of a non-working card to a disk image with disk util and then mounting it. Same error.
I bought a FCP7 book that contained a DVD with all kinds of media, including sample avchd. The sample avchd was the same folder structure i see when I look at the contents of one of my cards. L&T can see the files I copied from the DVD which are buried in a directory structure within the DVD.
I have not determined if L&T can’t read the non-working cards because of the card itself or because of a flaw in the directory structure. My next tests will be formatting a non-working card shooting new clips and also just copying a non-working card onto the desktop. I might also try taking the contents of a nonworking card and copying it clip at a time into and over the contents of the test folders included in the DVD if you follow what I’m saying. I’d like to find out of one clip is breaking the whole thing or what.
For some reason L&T has dependencies on the folder contents of the entire AVCHD structure. That must be how you can import a small segment of a full clip (the sole reason I have any interest in L&T).
Currently I am using Neoscene to import clips and it works just fine. My only complaint is it only brings in full clips (not a BIG deal) and that importing into specific folders is a little clumsy.