Hi there.
I have the same problem with krpano tools 1.20.2 running on Linux 64.
Version 1.20 works fine.
Uncaught node.js Error
RangeError: Attempt to allocate Buffer larger than maximum size: 0x3fffffff bytes
at new Buffer (buffer.js:61:11)
at Socket.eval (file:///tmp/.org.chromium.Chromium.cXd7rW/%7Bappdata%7D/ipc/ipc.js:1:2050)
at Socket.EventEmitter.emit (events.js:98:17)
at readableAddChunk (_stream_readable.js:156:16)
at Socket.Readable.push (_stream_readable.js:123:10)
at Pipe.onread (net.js:509:20)