We have identified issues that can result in tabix giving a segmentation fault.

1) Tabix does not support the UCSC header line. You'll have to remove this line
track name=blabalh description="more blah blah"

2) Columns in a bed/gff file must be seperated with tab characters, not with regular spaces. Tabix will give a segmentation fault when trying to index a file with spaces instead of tabs.

3) There should be no comment lines (lines starting with #) in the bed/gff file.

4) There should be no empty lines, or lines with only white spaces.