The only thumbnails you can see in the Media Browser are for Panasonic P2 clips. If you'd like to see others, make a request: Adobe Feature Request/Bug Report Form
Bridge won't let you preview AVCHD clips, either. However, there is another application that you already have that will: OnLocation. It will let you access the AVCHD folder structure a little more sanely, and you can even create an OnLo project into which you "import" the AVCHD clips you want. From there, you can access the OnLocation project in the Premiere Pro Media Browser and import all or some of the clips from the OnLo project.
Brilliant. It even works! And now (whoppee!) I get to learn a new program! ;-)
Funny that On Location doesn't load my .mov files from my DSLR though - so I get to use a smattering of previewing software.
Thanks though - thought I'd never even know what 'On Location' was for. Not that I do now, but I'm sure I'll learn.
Thank you. Good answer.
You're welcome And sorry if I gave you more work!
Not sure why your DSLR clips are not showing in OnLocation--that's very odd.
Actually, I just tried this and discovered that you're correct--the various Canon DSLR clips I have don't work there. Hmm... bug report at the same link as above...!
Man, ain't nothin' easy...
But then, neither do my still files - whether raw or jpeg (in On Location). In fact, ONLY my MTS files show up there.