Function: strip_tags()
Test input: http://66.28.101.38/shift.htm

Unexpected result: The result string is cut off after a few sentences and ends with extraneous !!!!!!!! marks. Not all input would generate this error but most of the time with Microsoft Word created dirty documents as the test input above will demonstrate.

Probably cause: Totally speculation but my guess is that there is a funk in the code in the string function dealing with UTF-8 characters common in Microsoft generated stuff.