IDE :: CS4 Cannot Publish Or Test Movie?

I have had to go back and update my first ever Flash/ActionScript project. I was just learning so there are 1000's of lines of code all in frame. However, it worked and at least I understand what everything means. he problem:I made a bunch of changes, always doing several tests (test movie). I then made a backup of the file (luckily). I then noticed a number of more things to change, and after changing them and fixing some typos caught by the compiler, I test again. The progress bar slides across, disappears, and my movie never comes up. I checked the folder, and no .swf is there. When I publish, the same thing happens, progress bar completes, but no file was created.

Here are some findings from my own troubleshooting:-While compiling I open the folder and see the .swf is created then deleted- Backed up version still works (as well as other files) -- suggests I changed something causing the malfunction- No compiler errors (if I purposely create errant code, it will throw compiler errors though) -- contradicts conclusion of above- Copied all code (I think, didn't document which code changed too well) that was changed between backup copy and full-up-to-date copy to new blank file and compiled fine- Re-Save As-ed the full-up-to-date copy under new name and folder -- did not fix problem -- interestingly this new file is substantially smaller than original (og. 4.5 mb new 1.8 mb) -- also while trouble shooting the original file went from 4.5 mb to 3.8 mb
- Restarted flash and then computer - did not fix- Tried testing on different computer - Errant video loaded with a runtime error #2004 unhandled IOError Error #2036: Load Never Completed -- interestingly enough I don't recall there being any loader or loading going on in the whole programI did a search, and found some recommendations for a similar problem, but for them test movie would work once and then the person would have to restart flash to test again. This is not whats happening (and I did the recommendation anyway and none worked). Each post I see the same problem as here, there are never any responses (lets hope I break this trend).