Arduino frozen after 4 String concatenation

tested with an Duemillanova win7/64

IDE 0.22 runs fine

IDE 1.0 blocks quite fast with the following output

Ready
Creating myString
myString: abcdefg,123123
done!
Creating myString
myString: abcdefg,     123
done!
Creating myString

Can you try with the 0.22/0.23 IDE ?