Errors with ajax upload after upgrade to 3.7

<already posted yesterday but deleted by forum restoration>
Hi,
I have js errors since I upgraded my sites to Joomla and Fabrik 3.7 :
- On form page load Firebug returns "no content option set for window.html - mootools-ext.js:3:234" if there is an ajax upload field on the form
- when I try to use ajax upload in returns a popup with : "Error: unable to upload file"

What I did :
- Upgraded Joomla to 3.7.3 with Joomla update component
- Upgraded Fabrik component in Extensions > Update
- Downloaded the latest Github master and performed a full FTP update

Can you reproduce ?

Thanks for any help with this,
Theo
 
I can see the log entry (no error) "no conten option...".
But ajax upload is working fine.
Did you clear all Joomla and browser cache?
 
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