num core > 1 causes issues about scde HOT 2 OPEN

I can add from my side, the same code worked with 4 cores (the maximal) on MacOS and it didn't on unix system (ncore set to 4 as well while the max cores is 12).

Here are sessions Infos. 
Unix

> sessionInfo()
R version 3.3.2 (2016-10-31)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: CentOS Linux 7 (Core)

locale:
 [1] LC_CTYPE=fr_FR.UTF-8       LC_NUMERIC=C              
 [3] LC_TIME=fr_FR.UTF-8        LC_COLLATE=fr_FR.UTF-8    
 [5] LC_MONETARY=fr_FR.UTF-8    LC_MESSAGES=fr_FR.UTF-8   
 [7] LC_PAPER=fr_FR.UTF-8       LC_NAME=C                 
 [9] LC_ADDRESS=C               LC_TELEPHONE=C            
[11] LC_MEASUREMENT=fr_FR.UTF-8 LC_IDENTIFICATION=C       

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

MacOS
> sessionInfo()
R version 3.3.2 (2016-10-31)
Platform: x86_64-apple-darwin16.1.0 (64-bit)
Running under: macOS Sierra 10.12.2

locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] scde_1.99.4     flexmix_2.3-13  lattice_0.20-34 RSQLite_1.1-1  

loaded via a namespace (and not attached):
 [1] Rcpp_0.12.8               nloptr_1.0.4              RColorBrewer_1.1-2        tools_3.3.2               Lmoments_1.2-3            digest_0.6.10            
 [7] lme4_1.1-12               memoise_1.0.0             tibble_1.2                nlme_3.1-128              mgcv_1.8-16               Matrix_1.2-7.1           
[13] DBI_0.5-1                 parallel_3.3.2            SparseM_1.74              RcppArmadillo_0.7.600.1.0 extRemes_2.0-8            MatrixModels_0.4-1       
[19] locfit_1.5-9.1            stats4_3.3.2              grid_3.3.2                nnet_7.3-12               Biobase_2.34.0            distillery_1.0-2         
[25] Rook_1.1-1                BiocParallel_1.8.1        minqa_1.2.4               limma_3.30.7              car_2.1-4                 edgeR_3.16.5             
[31] pcaMethods_1.66.0         modeltools_0.2-21         MASS_7.3-45               BiocGenerics_0.20.0       splines_3.3.2             assertthat_0.1           
[37] RMTstat_0.3               pbkrtest_0.4-6            brew_1.0-6                quantreg_5.29             rjson_0.2.15              Cairo_1.5-9