Android :: NotFoundException And FileNotFoundException When Running App On1.5

I'm trying to backport an android 1.6+ application to android 1.5.

Following the advice here...

http://comments.gmane.org/gmane.comp.handhelds.android.devel/97051
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... I have done the following:

Modify AndroidManifest.xml to set minSdkVersion to 3
Move all of my files that were previously in drawable-mdpi/ to drawable/
Rename drawable-hdpi/ to drawable-hdpi-v4/

It seems to me that this should ensure that 1.5 devices use the files in drawable/ while 1.6 and later devices use the files in drawable/ and drawable-hdpi-v4/ as appropriate. The drawable/ and drawable-hdpi-v4/ directories are the only drawable directories in my res folder.

However, after I compile, install, and run the resulting binary on the 1.5 emulator, I get the following error:

CODE:......

For reasons I don't understand, 1.5 devices are not able to see the bg.png image file, a version of which is in both the drawable/ and drawable-hdpi-v4/ directories.

Running the same binary works fine on 1.6.

Why won't 1.5 devices see my res/drawable/bg.png image with this setup?

As described in Providing screen resource compatibility for Android 1.5, I'm using Android SDK r6 and have put my mdpi resources in the drawable/ directory. Also, I've verified that the problem isn't isolated to bg.png. If I remove the reference to the broken drawable in my xml, the app breaks on the next and each subsequent graphic during setContentView().