Error: Could not find compiled resource bundle 'components' for locale 'en_US'

You have two posts. I will try to answer each completely.  Second one first. You say I should change my build to include the framework resources.  I am afraid I am not sure which and what to do there.  We combine all our properties file into one large one, then use the following build line:

mxmlc -locale=fr_FR,en_US -source-path=. ^
     -compatibility-version=3.0.0. ^
     -static-rsls=true ^
     -include-resource-bundles=resources ^
     -output src/main/resources/bundles/mypals/fr_fr_resources.swf

I am assuming you are telling me to change the "-include-resource-bundles" line, but what to add?  The "sdks\4.0.0\frameworks\locale\en_US" holds 13 swf files.  I tried adding that entire folder (along with the fr_FR folder) to the project library path (in the project properties dialog), but that made no change.  I also tried reverting the library path tab back to "MX Only" instead of "MX + Spark", but again no change.

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For your first message, I did a search for 'spark' in the entire project.  It only existed on 3 lines, each at the start of css files:

    @namespace s "library://ns.adobe.com/flex/spark";

I had put those in based on reading needed changes to naming in CSS.  Since I was not actually using any spark ('s') components yet, I removed these lines.  The entire project now does not have the word 'spark' anywhere in it. No change in behavior (as I expected).

I did a search for "s:" throughout the project.  That does exist in probably 100 places, but all are legitimate. Things like (xmlns:mx="http://www.adobe.com/2006/mxml") or variable names ("var matches:Object").  No reference to any s: object.  (While on the topic, why does FlashBuilder still not have a "whole word" box to limit searches??).

Note that when I first reported this problem, the compiler was set to ONLY support fr_FR.  In fighting this, I changed it to "en_US,fr_FR" hoping that would tell the compiler to load whatever en_US items it was looking for.  We really do not want any English support in this version. (We do have another SWF created with only support for en_US, and another for en_UK, etc.  Each language is a separate node on our server, so there is no need to mix & match at runtime)

The console shows a lot of swf loads that I do not understand...

The console output shows (my comments after ==> indicator)

[SWF] C:\ConnectedProducts\common-web\myname\bin-debug\myname.swf - 2,229,992 bytes after decompression
             ==> our locale is set here, after the above load and before the next line
Look for name file at: ./data/fr_fr/names.csv
[SWF] C:\ConnectedProducts\common-web\myname\bin-debug\myname.swf - 21,200 bytes after decompression
Loaded 2278 names.       ==> indicates successful load of data retrieved from server
Loaded 154 bad words     ==> our second data set has been retrieved and loaded
[SWF] C:\ConnectedProducts\common-web\myname\bin-debug\styles\mypals_style.swf - 58,777 bytes after decompression
[SWF] C:\ConnectedProducts\common-web\myname\bin-debug\styles\mypals_style.swf - 322,606 bytes after decompression
[SWF] C:\ConnectedProducts\common-web\myname\bin-debug\bundles\mypals\fr_fr_resources.swf - 595,025 bytes after decompression
[SWF] C:\ConnectedProducts\common-web\myname\bin-debug\styles\mypals_style.swf - 202,168 bytes after decompression

    ==> not sure what this next warning means.  I'm guessing I will later have to research it and return to 'secure' comm with server, but I'm ignoring for now
Warning: Ignoring 'secure' attribute in policy file from http://fpdownload.adobe.com/pub/swz/crossdomain.xml.  The 'secure' attribute is only permitted in HTTPS and socket policy files.  See http://www.adobe.com/go/strict_policy_files for details.

Resource bundle loaded for locale fr_fr  ==> at this point, we appear to have our French assets loaded successfully
[SWF] C:\ConnectedProducts\common-web\myname\bin-debug\styles\mypals_style.swf - 202,168 bytes after decompression
[SWF] C:\ConnectedProducts\common-web\myname\bin-debug\styles\mypals_style.swf - 1,303,976 bytes after decompression

[Unload SWF] C:\ConnectedProducts\common-web\myname\bin-debug\myname.swf  ==> some runs see this, but others do not. I expect it is a timing issue of whether it is reached or not before the crash

[SWF] C:\ConnectedProducts\common-web\myname\bin-debug\styles\mypals_style.swf - 794,898 bytes after decompression
[SWF] C:\ConnectedProducts\common-web\myname\bin-debug\styles\mypals_style.swf - 194,635 bytes after decompression
[SWF] C:\ConnectedProducts\common-web\myname\bin-debug\styles\mypals_style.swf - 261,589 bytes after decompression

==> everything looks fine up to here.  This is then when the third call to installCompiledResourceBundles occurs

Error: Could not find compiled resource bundle 'components' for locale 'en_US'.
    at mx.resources::ResourceManagerImpl/installCompiledResourceBundle()
    at mx.resources::ResourceManagerImpl/installCompiledResourceBundles()
    at mx.core::FlexModuleFactory/installCompiledResourceBundles()
    at mx.core::FlexModuleFactory/docFrameHandler()
    at mx.core::FlexModuleFactory/docFrameListener()