R crashes when communicating with JAGS

There is a thread on this topic already:
http://finzi.psych.upenn.edu/Rhelp10/2010-August/250934.html

I'm rather mystified by a similar problem and wondering whether I've
overlooked something obvious. I'm running with latest versions of R and
all packages, and latest version of JAGS running under Windows 7.

Here's the problem. I have some source code. It's given below - standard
stuff - seeds example from BUGS volume 1. I'm using R2WinBUGS only to
create the model file, and R2jags as a front end to JAGS. I have the
same problem whether or not I use R2jags.

1. If I start RGUI and source the code from a source file. R crashes
when it tries to execute jags().

Problem Event Name: APPCRASH
Application Name: Rgui.exe
Application Version: 2.131.56322.0
Application Timestamp: 4e171fac
Fault Module Name: StackHash_486a
Fault Module Version: 6.1.7601.17514
Fault Module Timestamp: 4ce7ba58
Exception Code: c0000374
Exception Offset: 000ce653
OS Version: 6.1.7601.2.1.0.768.3
Locale ID: 2057
Additional Information 1: 486a
Additional Information 2: 486a33f7a181da7ba2feae88b7ee12b6
Additional Information 3: 9e02
Additional Information 4: 9e02b3fab8ac2ab41c0e936dfef5c6d4

2. If I start RGUI and cut and paste the code from a source file.
Everything works fine.

3. If, after (2) I source the code - and other examples from source
files - everything works fine.

This seems to indicate that there is some kind of initialization which
needs to happen before JAGS will work; that this initialization is
carried out when typing commands into the console, but not carried out
when sourcing identical commands from a source file.

I have tried delaying issuing the jags command when sourcing (using
readline()) in case the issue was with readiness of the bugs model being
written to file; but the crash still happens with any such delay.

I'd be most grateful for tips to circumvent this behaviour.

Cheers,

David

Here's the test code:
#-------------------------------------------
require(R2WinBUGS)
require(rjags)
require(R2jags)
## write model file:
print(list.modules())
write.model(con="blah.bug",model=function() {
for( i in 1 : N ) {
r[i] ~ dbin(p[i],n[i])
b[i] ~ dnorm(0.0,tau)
logit(p[i]) <- alpha0 + alpha1 * x1[i] + alpha2 * x2[i] +
alpha12 * x1[i] * x2[i] + b[i]
}
alpha0 ~ dnorm(0.0,1.0E-6)
alpha1 ~ dnorm(0.0,1.0E-6)
alpha2 ~ dnorm(0.0,1.0E-6)
alpha12 ~ dnorm(0.0,1.0E-6)
tau ~ dgamma(0.001,0.001)
sigma <- 1 / sqrt(tau)
})
g<-jags(model.file='blah.bug',
data = list(r = c(10, 23, 23, 26, 17, 5, 53, 55, 32, 46, 10, 8, 10, 8,
23, 0, 3, 22, 15, 32, 3),
n = c(39, 62, 81, 51, 39, 6, 74, 72, 51, 79, 13, 16, 30, 28, 45, 4, 12,
41, 30, 51, 7),
x1 = c(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1),
x2 = c(0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1),
N = 21),
parameters=c('alpha0', 'alpha1','alpha2','alpha12','tau'),
inits=list(alpha0 = 0, alpha1 = 0, alpha2 = 0, alpha12 = 0, tau = 1) ,
n.iter=10000)
#-------------------------------------------