Hi, just upgraded my RB1100AHx4 from 6.49.17 to 7.12.1 and had a few issues that I thought I might share in case anyone had similar issues.
Here is what I found:
1. Dropped the Internet> Gateway setting to 0.0.0.0 (go to Quick Set to fix)
2. Changed the IP Address Interface to ether2 from ether 1 (go to IP>Address List and double click on the network address to set the interface)
3. Don't forget to upgrade the Dude Client to match the new version
4. Upgrade the bootloader to match the new version (go to System>Routerboard and click on upgrade)
Hopefully this post might help someone having similar issues.
Cheers MickDD