I too get the errors when attempting to "mark all messages read" and I have the latest versions of both browsers (IE 4.04 and Communicator 4.06) in addition to the preview release of Netscape's Communicator 4.5(2). It occurs in all three instances.
However, I have discovered that this error only occurs when you have frames turned off. It does not happen with "Frames ON". Perhaps this tidbit of info may help you in locating the cause of this problem.
ciao 4 now!!
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