On a 64-bit host (e.g. 64 bit Linux), the VM will crash when attempting to connect to SqueakMap.
SmartSyntaxPluginCodeGenerator>>generateCPtrAsOop:indent: is the culprit, failing to account for sqMemoryBase when deducing an oop from a pointer. This actually effects lots of plugins, notably including the SocketPlugin.
Fix is on Mantis 5688.
Dave