I have loaded V3Beta5 and it's looking good. One small bug is that RouterOS registration table isn't showing the Tx/Rx rate for some reason. Is there a work around or is it a bug?

check that you have not disabled the 'Tx/Rx Rate' column from the table. It
should be there.

Uldis, actually I have had to back out of 3.5 back to 2.2 I had a strange problem occur with two very stable 530's running 2.9.1 It happened twice after I had upgraded to 3.5 that they locked up at 100% CPU. I could not identify why, the only thing that had changed was upgrading the Dude. I have now downgraded to see if the problem goes away. I have a strong suspicion that the Dude triggered the condition. Any thoughts would be welcome