Why does IGV turn a VCF QUAL of "." into -10? IGV is turning QUAL "." into -10 from this VCF of structural variations.  I'm wondering if this means anything or if I should report a bug to the IGV devs.

Here's a row from a VCF:

#CHROM  POS ID  REF ALT QUAL    FILTER  INFO    FORMAT SAMPLE

chrY    11292098    DUP00008569 C   &lt;DUP&gt;   .   PASS    IMPRECISE;SVTYPE=DUP;SVMETHOD=EMBL.DELLYv0.8.1;CHR2=chrY;END=56834684;PE=3;MAPQ=24;CT=5to3;CIPOS=-265,265;CIEND=-265,265    GT:GL:GQ:FT:RCL:RC:RCR:CN:DR:DV:RR:RV0/1:-5.71458,0,-20.0913:57:PASS:0:90774:0:-1:6:5:0:0


You see the QUAL value is "."

IGV reports it as -10



(This call is probably a false positive but it's just an example. There are others)
Looks like they are treating the "." as a value of 1.  According to the VCF spec the quality is "−10log10 prob".  Where are you getting your QUALs from?  I have never seen the quals as a "." and IGV probably needs to do some translation into an int but a QUAL of -10 makes no sense. 

I would report it and let them explain.