Pathauto cannot load node available tokens

Good morning,

We have just upgraded a very large website with hundreds of fields from D6 to D7, and we encountered problems with tokens in patterns tab (white screen for example). Here we are today.

Configuration :

• Drupal 7.39 (development server)
• Token 7.1.6
• Pathauto 7.1.3

We have also installed Token tweaks 7.x-1.x-dev (2014-Jan-27) to reduce depth. So :

• Depth = 1: Tokens display nicely on Patterns page (node, taxonomy and user) => see 'Node token - Detph 1' attached.
• Detph = 2 and more: Taxo and user tokens display nicely, but node tokens never show up, ie 'Loading token browser' remains displayed => see 'Taxonomy tokens - Depth 2' and 'Node tokens - Depth 2' attached'.

We at least need the depth 2, because we need custom date formats.
Thanks for your help !

Bye