When using the cursor keys in the alignment tool (old interface) it can no longer move entire blocks left and right, just one item and then the whole thing goes haywire. That's a bug.
I am able to move entire blocks by selection (old interface). Click segment in alignment tool. Shift click second segment. Cursor left, right. You didn't say which client you were in.
Indeed, I am now also able to do this. I'm in client 2012-04-12-48422M-win_x86 now.
I'm sure I noticed it being broken, but cannto reproduce it now.
Thanks for checking !
Retracting this bug report…