blotter updatePortf issues

Hi,

I seem to have exactly the same problem as Hideyoshi described. Here is the
code that produce the problem. 
http://r.789695.n4.nabble.com/file/n4637443/quantstrat_test.R
quantstrat_test.R 

The sessionInfo is:
R version 2.15.1 (2012-06-22)
Platform: i386-pc-mingw32/i386 (32-bit)

locale:
[1] LC_COLLATE=Chinese (Simplified)_People's Republic of China.936 
[2] LC_CTYPE=Chinese (Simplified)_People's Republic of China.936   
[3] LC_MONETARY=Chinese (Simplified)_People's Republic of China.936
[4] LC_NUMERIC=C                                                   
[5] LC_TIME=Chinese (Simplified)_People's Republic of China.936    

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

other attached packages:
[1] quantstrat_0.6.8           blotter_0.8.10            
[3] FinancialInstrument_0.15.1 quantmod_0.3-17           
[5] Defaults_1.1-1             TTR_0.21-1                
[7] xts_0.8-6                  zoo_1.7-7                 

loaded via a namespace (and not attached):
[1] grid_2.15.1    lattice_0.20-6 tools_2.15.1



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