Rich Pizzarro wrote: ConverterInputStream::ConverterInputStream(nsIInputStream * 0x00000000, nsIUnicodeDecoder * 0x038e1de0, unsigned int 0) line 188 + 12 bytes NS_NewConverterStream(nsIUnicharInputStream * * 0x038e2128, nsISupports * 0x00000000, nsIInputStream * 0x00000000, int 0, nsString * 0x00000000) line 309 + 39 bytes nsPersistentProperties::Load(nsPersistentProperties * const 0x038e2120, nsIInputStream * 0x00000000) line 182 + 22 bytes nsStringBundle::nsStringBundle(nsIURL * 0x038e2290, nsILocale * 0x00000000, unsigned int * 0x017ef8e4) line 94 + 22 bytes nsStringBundleService::CreateBundle(nsStringBundleService * const 0x038e2450, nsIURL * 0x038e2290, nsILocale * 0x00000000, nsIStringBundle * * 0x017ef988) line 151 + 39 bytes Where the input stream is null. Any ideas? Yes. Does the property file actually exist, and is it in the right directory? There is a netlib bug where it returns a success code even though it hasn't succeeded. I guess my code could check the null pointer as well as checking the result code. I will try to check in a fix for this soon, but could you try putting the property file there? Erik