deb's right. Derek, you can't arrange thumbnails - you can arrange icons. Two different things there. Thumbnails are only available in list view.
Shift + H toggles the view.
Keep in mind that on the project level you want to stay in list view.
Only change icon views in clips bins. To open a bin in its own tab, Option + double click.
Kevin Monahan
Social Support Lead, DV Products
Adobe
Adobe After Effects
Adobe Premiere Pro
Adobe After Effects and Premiere Pro Community Blog
Follow Me on Twitter!