[galaxy-user] filtering pile-up fails

Dear All, I have been successful by using the online tool to align Illumina pair end reads , each direction 5GB, and also generated a pileup of 680,000,000 lines, but the filtering of the pileup always fails, it runs for several hours and I get an empty file back. I tried different options and different pileups, always the same. Could somebody please help or what is the trick? Thank you Sebahattin