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There are no problems known when the evaluator runs in text mode or in window mode or in applet mode with the JDK appletviewer.
As for execution as an applet in a Web browser, we have tested the evaluator with various versions of Netscape Communicator on Linux and Windows and with Microsoft Internet Explorer on Windows. There are several problems caused by Java/AWT bugs in these browsers.
Forward), on return to this page the applet may not be able to gain the focus again.
This seems to be due to an error in AWT. Do not leave the page (use the middle
mouse button to open a link in a new frame) or press the keys
Reload to reload the applet.
Forward), the applets are restarted (i.e., they do not preserve their previous state).
This is apparently a feature of the Internet Explorer. Do not leave the page if you want to have the applet state preserved.
This seems to be due to an error in multi-threading. Wait until the corresponding execution has terminated or kill the browser.
This behavior seems to be due a Java internal problem; apparently it does not indicate any significant troubles. Ignore the messages.
Since we have found workarounds, one should not encounter these problems any more.