Every time I boot the Amiga, it does this, and an Intuition error comes up shortly afterward stating that it is trying to reset the Workbench screen. Workbench shows up as default resolution and color depth, and does not load my P96 settings.
This is AmigaOS's usual behavior for early errors. You will be used to it if you start customising your AmigaOS.
Use the backdrop buttons of the windows to get CacheCDFS's message in front. Once the uae.device message is confirmed, Intuition will change the screen mode to your preferences (if you did not cancel Intuition's requester).
Bye,
Thomas