OK, so installed the quick fix patch and perhaps things improved a little - and also I think some of the things I was experiencing were maybe due to not yet being familiar with the changes - pilot error sort of thing!
However all that said, I still experienced strange, erratic behaviour from time to time - one error that did repeat itself which is worth mentioning, was constant freezing of the reported volume on the track itself, but all was OK on the inspector / and console views.
After a couple of days my feeling was this strange error problem all seemed to be linked in one way or another with GUI / display drivers etc.
I run 64 bit windows 7 on a SandyBridge 2600k running at 4.5GHz i7 with 16gb ram. Windows fully updated. Motu 896Mk3 with latest drivers.
I kept my X1 as was and have now reverted to this at it is rock solid.
I can see some of the new improvements being good once you know fully how to use them, but for the time being X1 + stability will win out for me!
So I think I shall put X2 back in the cupboard for the time being and shall try again after the next patch comes out - hopefully this will cure the stability issues etc
Nigel