MEDIA MANAGER NOT HANDLING AFTER EFFECTS 7.0 RENDERS

Question

Media Manager works on my captured DV footage. However, when using an After Effects QT movie copy of my credits, it failed. I spent several hours on this since it initially was my "test."
I gave up then tried my captured footage, canceling before actually processing it. Voila! I could finally see a change in the bar graphs. Any ideas why this happened? Can't insert a screenshot of my afx settings (ugh!) so I've typed them. Thanks for helping!!!
After Effects 7.0
RENDER SETTINGS BASED ON BEST SETTINGS
Resolution: full
Size: 720x480
Proxy use: no proxies
Effects: Current Settings
Disk Cache: Read Only
Color Depth: Current settings
Frame Blending: on for checked layers
Field Render: off
Pulldown: off
Motion blur: On for checked layers
Use openGL: off
Solos: current settings
Frame rate: 29.97
OUTPUT MODULE BASED ON QT DV NTSC 48KHZ:
Format: qt movie
Output info: DV/DVCPRO-NTSC
Spatial Quality=Most(100)
Embedding: project link
Output Audio: 48,000kHz/16bit Stereo
Channels:RGB
Depth: Millions of Colors
Color: Premultiplied
Final Size: 720 x 480
Stretch: -
Crop: -
MacBook Pro   Mac OS X (10.4.7)   1G RAM, 500G LaCie HD

Answer 1

There can be problems with media manager if your source clips do not have a reel associated with them (as happens with imported files as opposed to captured material). Try creating a tape name in the browser for these clips. This may solve your problem.