So, I can run the GA (Kriging/CoKriging; default parameters worked best for my purpose) without any problems and do get a nice GA layer. This is what happens when I try to export the GA layer to a raster file: 1) Nothing happens (accepted default values in the GA Layer to Grid Window [output cell size: 1,573181523475E-05]): error message says that the output surface raster is <empty> (ERROR 999998: Unexpected Error), failed to execute. 2) When I choose to change the output cell size to 1 (which is in fact what I want), then a raster file is in fact produced. However, the high and low values are completely off (high: 3,40282e+038; highest value should be something around 4,2). When I try to classify (Properties, Symbology), I get the following error message: Failed to initialize classify renderer (possibly too many unique values). Does this help you? Thanks for your help.
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