I prefer the workaround on this case from Sun Support (quoted since most of you probably don't have Sun Support accounts):
    Bug Description: Under 2.7 (on pasta displayed remotely) rapidly clicking mouse buttons (1,2 and 3) on day, month, week and year view buttons, in dtcm with LANG=he_IL, gets the following XError: [blah, blah, blah]

    Workaround: Don't pound on the mouse like a wild monkey.
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Bitt Faulk