Easytheme2 and 2.3 elgg

Hy,

I have a problem with Easytheme2 and 2.3 Elgg.

Atfter 2.3 update some people can't access the groep they have a gray block and no content (see image)

https://www.dropbox.com/s/96d547klk4w6f59/15871341_613682885491442_1395029083_n.jpg?dl=0

Any idea?

Gr Bas