Automation on a send not working

Hi,
 
Now this has me puzzled.
 
I am tryting to write a very simple send envelope to a Delay set up on a buss, the delay works fine but then as soon as I engage the write function the send stops working. but the envelope get written correctly.
 
More weirdness
 
When I try playing the track back, the Read function doesnt work either ie no movement on the send. If I delete the envelope the send still wont work not even manually by moving the level using the mouse.  If I delete the send and set it up again all works fine until I hit write automation again, then it stops sending again.  If I look on the delay buss there is no activity on its level, so it seems somehow the write automation is completely disengaging the send.
 
Thinking this maybe a problem with this track alone, I copied all data to a new track, exactly the same.  I have also tried automating a reverb on a different track.... no joy, the same happens.
 
I have tried automating the send from different views track/console, every screenset I have set up that will allow access to the send control.  
 
I've tried automating using remote control using my A-Pro 500.  Automating using the mouse.
nothing.
 
I have tried disengaging the Pro Channel on the track, deleting the effects in the tracks effect bin, reordering the sends on the track in fact everything I can think of.
 
Thinking this may be a problem with the new Hotfix for X1 Expanded, I set up a new test project, and of course, everything works as expected..... So its definately a project specific problem.  The project was started in X1E but before the latest hotfix.  The project was also setup using my own Project template.
 
I should say I am using X1E latest hotfix
X1 32
 
Any thoughts very much appreciated.
 
VMT