Rendering errors in the GTP shell window occur which disappear after manually resizing the window. This is probably a bug in the Java libraries. With Java 1.4.2 for Linux this problem seems to have disappeared after introducing a workaround which resets the window size after each text update. With other Java versions or on other systems the problem still exists.

The pop up window with automatic command completions sometimes hides the text entry when typing. This is a problem in some implementations of the Java 1.4 libraries. You can disable automatic command completion from the GTP shell menu.

Unfortunately it is not possible with java.io to guarantee that stdout/stderr of the Go program are in order, since stderr must be read from a different thread. Using java.nio is not possible with the output streams of a process. GoGui tries very hard to keep the order of stdout/stderr, but sometimes it fails, especially if the Go program writes a lot to stderr before writing the response to a command to stdout. Also note that the Go program must flush stderr after writing, because stderr is buffered when running a child process.