I have nodiced problems with ROS version 5beta (tested on beta4 and 6) on x86. Motherboard is Fujitsu siemens D1567. System hangs while 30s after boot and require power off/on. Solution is removing all radio interfaces from pci slots, then downgrade to 4.11 or 3.30 and install radio interfaces. I have tested it on few D1567 motherboards with various radio interfaces. 3.30 and 4.11 and other ROS on this board are rock stable.

Sorry for my poor english