I tried it last night but I have still the issue even with the latest build (46471). I'm currently using the following code to create the file
$objWriter = PHPExcel_IOFactory::createWriter($_AMIEExcel, "Excel5");
Should I use something different?
I'm not sure if this helps. The software which I try to use the created excel spreadsheet with is using the Apache POI java (http://poi.apache.org/spreadsheet/index.html) library to read the file and that is throwing the "block[ 0 ] already removed"