collapsed cut the gmap

Hi, using collapsed_text module whith gmap for display it collapsed:
[collapsed title="Mapa de Google colapsado"][gmap markers=drupal::43.249204,-3.34259][/collapsed]
The map is partially cut and moved. I try change properties like "collapsehack" but it´s not found.
I think The bug occurs when maps load with no size defined, but I not sure.
thanks