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optim hangs without warnings or error

Hello,

optim hangs for some reason when called within the betareg function
(from the betareg package).

In this special case, the arguments which are passed to optim cause
never ending calculations.

I uploaded the arguments passed to optim on:
https://www.dropbox.com/s/ud507gbpt3gkbcp/optim_arguments.RData


I appreciate any help.
Cheers,
Katja
R version 2.15.3 (2013-03-01)
Platform: x86_64-pc-linux-gnu (64-bit)

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

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

loaded via a namespace (and not attached):
[1] betareg_3.0-2     flexmix_2.3-8     lmtest_0.9-30
modeltools_0.2-19
[5] multcomp_1.2-15   sandwich_2.2-9    stats4_2.15.3
tools_2.15.3