Bug when loading Category including at least one sub category

[Tanguy Bodin-Hullin]

When I create a new subcategory via the admin panel, the parent category doesn't load well any more : the loading stops at about 2/3 of the loading bar.

When I use the API for creating a new subcategory, I get the same problem. The insertion with my PHP program works, and the sub-categories are visible in the admin panel, but the parent category doesn't load completely anymore.

Do you have any idea concerning this problem ?

Thank you.