If you post your log here that would help. It could be because, by default, PLINK will only output SNP x SNP interactions which pass a given p-value threshold, which is controlled with the --epi1 flag. Does setting '--epi1 1' work?
Options in effect:
--allow-extra-chr
--bfile BipolarfinalCC
--epi1 0.05
--fast-epistasis
Hostname: ADMIN1
Working directory: C:\Users\Administrator\Desktop\tplink_format\results_Bipolar
Start time: Wed Feb 01 22:44:37 2017
Random number seed: 1485956677
32688 MB RAM detected; reserving 16344 MB for main workspace.
107526 variants loaded from .bim file.
4806 people (2143 males, 2663 females) loaded from .fam.
4806 phenotype values loaded from .fam.
Using up to 8 threads (change this with --threads).
Before main variant filters, 4806 founders and 0 nonfounders present.
Calculating allele frequencies... done.
Warning: 2703 het. haploid genotypes present (see plink.hh ); many commands
treat these as missing.
107526 variants and 4806 people pass filters and QC.
Among remaining phenotypes, 1868 are cases and 2938 are controls.
--fast-epistasis: Skipping 2486 monomorphic/non-autosomal sites.
--fast-epistasis to plink.epi.cc ... done.
5516648280 valid tests performed, summary written to plink.epi.cc.summary .
If you post your log here that would help. It could be because, by default, PLINK will only output SNP x SNP interactions which pass a given p-value threshold, which is controlled with the --epi1 flag. Does setting '--epi1 1' work?