Right after you start sbengine with those -vvvv's, it should tell you all of the plugins that it is attempting to load. It will tell you if it can't load any of them. Do you see anything where it is failing to load the plugins? For example, on my Linux box here is what I see:
/home/rdowdall/Documents/workspace/sbengine/linux-x86_64-sdl-obj/bin/sbengine -vvvv /home/rdowdall/Documents/crank/samples/release/button-example/button.gapp
INFO (1487193856):DATA_PLUGINS Internal Handle 0x40ea11
INFO (1487193856):MODEL_PLUGINS Internal Handle 0x40b734
INFO (1487193856):IO_PLUGINS Internal Handle 0x4165c5
INFO (1487193856):ACTION_PLUGINS Internal Handle 0x41682a
INFO (1487193856):RENDER_PLUGINS Internal Handle 0x42c666
INFO (1487193856):SCREEN_PLUGINS Internal Handle 0x415494
INFO (1487193856):RESOURCE_PLUGINS Internal Handle 0x40fdc0
INFO (1487193856):Initialize Model Manager []
DIAG (1487193856):Table [radio_button_table] resized to 3 rows 1 cols
INFO (1487193856):Initialize IO Manager []
INFO (1487193856):Initialize Action Manager []
INFO (1487193856):Initialize Render Manager []
INFO (1487193856):Initialize Screen Manager []
INFO (1487193856):Initialize Resource Manager []
INFO (1487193856):Loading plugin from [/home/rdowdall/Documents/workspace/sbengine/linux-x86_64-sdl-obj/plugins//libgre-plugin-dev-input.so]
INFO (1487193856):Initialize plugin: [dev-input (1.1.0.0)] []
INFO (1487193856):Loading plugin from [/home/rdowdall/Documents/workspace/sbengine/linux-x86_64-sdl-obj/plugins//libgre-plugin-screen-path.so]
INFO (1487193856):Initialize plugin: [screen-path (1.1.0.0)] []
INFO (1487193856):Loading plugin from [/home/rdowdall/Documents/workspace/sbengine/linux-x86_64-sdl-obj/plugins//libgre-plugin-screen-dump.so]
INFO (1487193856):Initialize plugin: [screen-dump (1.1.0.0)] []
INFO (1487193856):Loading plugin from [/home/rdowdall/Documents/workspace/sbengine/linux-x86_64-sdl-obj/plugins//libgre-plugin-system.so]
INFO (1487193856):Initialize plugin: [system (1.1.0.0)] []
INFO (1487193856):Loading plugin from [/home/rdowdall/Documents/workspace/sbengine/linux-x86_64-sdl-obj/plugins//libgre-plugin-capture.so]
INFO (1487193856):Initialize plugin: [logger (1.1.2.3)] []
INFO (1487193856):Loading plugin from [/home/rdowdall/Documents/workspace/sbengine/linux-x86_64-sdl-obj/plugins//libgre-plugin-lua.so]
INFO (1487193856):Initialize plugin: [lua (1.1.0.0)] []
DIAG (1487193856):Loading LUA script [/home/rdowdall/Documents/crank/samples/release/button-example/scripts/toggle_button.lua]
INFO (1487193856):Loading plugin from [/home/rdowdall/Documents/workspace/sbengine/linux-x86_64-sdl-obj/plugins//libgre-plugin-timer.so]
INFO (1487193856):Initialize plugin: [timer (1.1.0.0)] []
INFO (1487193856):Loading plugin from [/home/rdowdall/Documents/workspace/sbengine/linux-x86_64-sdl-obj/plugins//libgre-plugin-event-redirect.so]
INFO (1487193856):Initialize plugin: [redirect (0.0.0.0)] []
INFO (1487193856):Loading plugin from [/home/rdowdall/Documents/workspace/sbengine/linux-x86_64-sdl-obj/plugins//libgre-plugin-dynamic-rext.so]
INFO (1487193856):Initialize plugin: [dynamic.rextension (1.1.0.0)] []
INFO (1487193856):Loading plugin from [/home/rdowdall/Documents/workspace/sbengine/linux-x86_64-sdl-obj/plugins//libgre-plugin-gesture.so]
INFO (1487193856):Initialize plugin: [gesture (1.1.0.0)] []
INFO (1487193856):Loading plugin from [/home/rdowdall/Documents/workspace/sbengine/linux-x86_64-sdl-obj/plugins//libgre-plugin-logger.so]
INFO (1487193856):Initialize plugin: [logger (1.1.0.0)] []
INFO (1487193856):Loading plugin from [/home/rdowdall/Documents/workspace/sbengine/linux-x86_64-sdl-obj/plugins//libgre-plugin-rext-external.so]
INFO (1487193856):Initialize plugin: [rext-external (1.1.0.0)] []
INFO (1487193856):Loading plugin from [/home/rdowdall/Documents/workspace/sbengine/linux-x86_64-sdl-obj/plugins//libgre-plugin-poly.so]
INFO (1487193856):Initialize plugin: [poly (1.1.0.0)] []
INFO (1487193856):Loading plugin from [/home/rdowdall/Documents/workspace/sbengine/linux-x86_64-sdl-obj/plugins//libgre-plugin-greio.so]
Do you see any errors during this phase?
