"Rendering Required Files" - huh?

I'm editing a sequence with a couple of nested sequences and a multicamera edit.  Suddenly I'm encountering huge delays when PP RANDOMLY decides it needs to do some rendering. I (seemingly at random) get the message "Rendering Required Files" and then I have to wait for minutes to do anything!
• There are no compilicated effects in any of the sequences.
• There are only a few tracks in the master sequence, and only one or two tracks of audio and/or video in the prior sequences.
• I have a dual quad core MacPro with 16GB of RAM.
• I have 4x1TB hard drives.
I can not for the life of me understand why it needs to render anything.  I get the feeling this has to do with audio, but I can not pin this down.  Can anybody explain what the heck the program is rendering so I can figure out a workaround?????

Not that I'm too much into the "me too" kind of reply, but I just wanted to add my data into this thread in hope for an eventual fix.
I'm using the PC version (CS5.5) with all the latest updates, on an Intel i7 (4 cores +HT), 24 GB RAM, 2 nVidia GTX470 (sli), a SolidState drive for OS and Apps, and 4x 2TB disks in RAID10 configuration for my data. I think the PC's performance should be more than adequate.
My projet seems similar to what other users have been describing. I have a first sequence on which I have laid 2 video tracks and 2 additional audio tracks. No video effect has been applied. As for audio effect, I have applied EQ and Dynamics on 2 of the tracks (not on the clips themselves). Ultimately, I ended up muting 3 of the audio tracks. Therefore, only 1 audio track ends up in my mix. The audio clip is an uncompressed mono WAV file which was generated by Audition (44.1kHz, 16bits).
On a second sequence, I laid the the video and audio parts of Sequence1 as two seperate clips, so they are completely unlinked. I have set the video clip to MULTI CAM. The audio clip having been laid on the sequence seperately is not influenced at by any of my video edits and camera changes. I have used this approach after reading other users' input on this thread.
When the dreaded "Rendering Required Files..." poped up, I did a couple of UNDO/REDO in order to pin point the exact operation after which the problem occurs. It happened right after I used the Razor Tool to cut my audio clip. At this point, I haven't move my clips' begin and end points. I only applied a cut somewhere in the middle of the audio clip and left it untouch. I can undo that cut and the problem dissapears. But as soon as I cut my clip again, I can no longer play my Sequence #2 without the "Rendering Required Files..." window poping up. I have several hours of video to edit. This happened at 35 minute into the sequence. I can't afford the time to wait for all the rendering to take place, only to end up in the same position where the application will not remember the render it just did.
Interestingly, I can play Sequence #1 with no problem. On Sequence #2, the problem persits even if I mute (click the speaker and eye icons) all audio and video tracks. I tried selecting a limited work area, even a blank are with no audio nor video, and I still have the problem when I hit the enter (preview) key.
Also, there's a yellow line on top of my timeline (both sequences) meaning Premiere should attempt to render the sequence on the fly.

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