I'm not familiar with Henry's distribution. I believe his changes with regards to form data charsets were integrated into 3.3.1+AD13 but I don't know what other changes he may have made. Does your distribution have a ChangeLog or other notes that might tell us?
You could try upgrading to 3.3.1+AD13+OACS1 on a test machine first - if that fails, a newer version probably would as well. http://uptime.openacs.org/aolserver-openacs/ If it works, at the very least you'll be in good company!