Posted 15 Aug 2008
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I am posting this solution in case someone else encounters this problem.
I was receiving the error "Spell Check Handler Server Error:500 Invalid length for a Base-64 char array." whenever the editor spell check button was clicked.
The problem turned out to this line in Web.config:
<globalization requestEncoding="utf-8" responseEncoding="ascii" />
This was left over from the Netscape 4.x days. NS4 used to display text as squares afer a window was moved over the browser, if UTF-8 enconding was used.
Changing the line to this solved the problem:
<globalization requestEncoding="utf-8" responseEncoding="utf-8" />