Another bug Paul - Flickr for HTC Sense and Instagram for HTC Sense (probably LinkedIn for HTC Sense too) settings do not survive a switch. This is when you add them either via Blinkfeed options or via 'accounts & sync'.
Further to this, I think 'Accounts & Sync' needs a good looking at in general. Some accounts that have been added don't show up in this list after a switch. Weather is an example. Another (more important) one is Exchange Activesync. The HTC Mail app appears to work but this is no longer showing in the 'accounts & sync' section.
Non-HTC accounts do appear to show correctly; including Dropbox, Google and Twitter.
That didnt work unfortunately. I did find something interesting though:
On the Sense rom, I have the Google search bar on the first homescreen (middle, with Blinkfeed to the left) and Catch notes widget on the right-most homescreen.
Switched to Google rom. Added catch notes widget on the first right homescreen.
Switched back to Sense rom - the Google search widget is gone and in its place is the Catch notes widget!!