On first start of Icaros Desktop 2.3.0 AROS freezes whenever I try to choose Screen Mode in native VESA and Safe Mode.. i replaced the Monitors and Drivers in DEVS: with the Files from Icaros Desktop 2.3.0 BETA 3 that did the Trick.
If you've saved a native (eg Nvidia) screenmode, a screenmode.prefs file will appear in Envarc: and, if you'll start AROS in VESA mode, it may create conflict and lead to a crash.