auto create treshold: blank page?

[after310]

Hi
I want to apply a treshold template to a device.
I select "Device" in the left menu, then my device, I click on "Create Graphs for this Host" and to finish, "Auto-create thresholds".
Problem, I am redirected on a web page (http://oftalmologix/plugins/thold/thold ... &hostid=12) but this page is empty, fully empty, I have a blank page.

Someone understand why and can help me ?

[after310]

er, some information:

After deleting and recreates the treshold templates, I can now apply the treshold template to a device, with "auto create treshold"; but I don't really know why that functions...