Thanks very much for your answer!
I got around to installing the Android SDK on my mac, and accessed my phone's log with logcat. The top of that file reveals the problem, here's a bit below. I don't use Amazon stuff on my phone, but I can't uninstall it - must be part of the "base" distribution. I'm running Verizon's official Android 5.0.2 release on an LG G2, for what it's worth. And I've tried updating (and un-updating) the Aamzon stuff.
I want to say it's a bug in Amazon's stuff and they should fix it.
Thoughts?
Dave
--------- beginning of crash
E/AndroidRuntime( 3814): FATAL EXCEPTION: Thread-401
E/AndroidRuntime( 3814): Process: com.amazon.mShop.android, PID: 3814
E/AndroidRuntime( 3814): java.lang.NoClassDefFoundError: Failed resolution of: Lcom/google/common/base/Preconditions;
E/AndroidRuntime( 3814): at com.amazon.avod.clickstream.PageType.<init>(PageType.java:54)
E/AndroidRuntime( 3814): at com.amazon.avod.clickstream.PageType.<clinit>(PageType.java:21)
E/AndroidRuntime( 3814): at com.amazon.avod.MShopAmazonInstantVideoDelegate.<clinit>(MShopAmazonInstantVideoDelegate.java:105)
E/AndroidRuntime( 3814): at java.lang.reflect.Method.invoke(Native Method)
E/AndroidRuntime( 3814): at java.lang.reflect.Method.invoke(Method.java:372)
E/AndroidRuntime( 3814): at com.amazon.mShop.aiv.AmazonInstantVideoProxy$AIVInitializationRunnable.initializeReflectively(AmazonInstantVideoProxy.java:121)
E/AndroidRuntime( 3814): at com.amazon.mShop.aiv.AmazonInstantVideoProxy$AIVInitializationRunnable.run(AmazonInstantVideoProxy.java:83)
E/AndroidRuntime( 3814): at java.lang.Thread.run(Thread.java:818)
E/AndroidRuntime( 3814): Caused by: java.lang.ClassNotFoundException: Didn't find class "com.google.common.base.Preconditions" on path: DexPathList[[zip file "/system/framework/com.google.android.maps.jar", zip file "/system/priv-app/AmazonMobile/AmazonMobile.apk", zip file "/data/user/0/com.amazon.mShop.android/app_dex/appstore.jar", zip file "/data/user/0/com.amazon.mShop.android/app_dex/misc.jar"],nativeLibraryDirectories=[/system/priv-app/AmazonMobile/lib/arm, /vendor/lib, /system/lib]]
E/AndroidRuntime( 3814): at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
E/AndroidRuntime( 3814): at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
E/AndroidRuntime( 3814): at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
E/AndroidRuntime( 3814): ... 8 more