I'm trying to create a virtual raster in QGIS 2.6.1 64b on Windows, but I get the message:
"The process failed to start. Either the invoked program is missing, or you may have insufficient permissions to invoke the program."
I try to read in a whole directory, selecting also to "Recurse subdirectories" it works for a part of my datasets, but not for all. I thought it is related to the the size of the datasets, so I tried dividing the bigger datasets in smaller directories. but it did not work.