Infopath form crashes when selecting second lookup field

Hi there,

I suffer from a strange behaviour in sharepoint 2010. I created an infopath form, which (besides lots of other fields) includes two lookup fields (1 and 2) which points to the same data list. Moreover there's a third lookup field (field 3) which also points to that data and is meant to be the filter for cascading dropdown. When I select a value from field 3, the data in field 1 and 2 is filtered according to the selected value. When I select a value in field 1 everything is allright. Then the selected entry from field 2 is removed from data of field 3 using data filter. When I select a value from field 3 the form crashes (which means the rendering crashes). All fields disappear and oly the red stars of required fields are shown. When I click the cancel button, all fields appear again ald the value is selected. Also when I move around the form panel, the fields are shown again. This problem only appears in IE. When I tried this in Google Chrome, everything works just fine. Also in the InfoPath preview it works. I am using IE 11.

Thanks for your help

Cheers,

Magnus