First off, thanks for the great ROM, looks wonderful on the Funbook.
So I installed cyanbook 0.4 a few hours ago and can see a few bugs.
1. USB OTG does not work correctly with flash drives.
Problem: The first time I plug the flash drive, it connects and shows up the data in /mnt/usbhost1. However, when I plug it out and insert it again, the device does not show up. However, if I connect the flash drive through a multi usb hub, it works as expected no matter how many times I plug the drive out of the hub.
Workaround: Using Chainfire's stickmount to overcome this limitation for now.
2. Apex Launcher does not show the icon names in the homescreen. The option to hide the icon names in unchecked. The only instance where the icon names come are if I disable the drawer button using "Show persistent search bar" set to never.
These are the two major bugs I could find right now. Will continue to do more testing to report back. Overall a smooth ROM with small issues with workarounds.
BTW, why did you go with the Apex Launcher. Isn't stock CM9 launcher a better option.