Sequence of characters not supported by psql/pg_dump

Hello,

	I use PostgreSQL 7.0.2 on linux.
	The base was set with initdb -E UNICODE.

	I have many Strings with accents (french language).
	Some of them aren't supported by queries or pg_dump:

WORKING EXAMPLE:
DB=# select * from element_attribute  where java_lang_string like 'Scholtè_s';
 doc_id | tag_id | java_lang_string | type | java_lang_integer
--------+--------+------------------+------+-------------------
(0
rows)                                                                                                                                  

NOT WORKING EXAMPLE (psql still waiting for characters to be entered):
DB=# select * from element_attribute  where java_lang_string like 'Scholtès';
DB'#

ERRORS IN FILE GENERATED BY PG_DUMP (AS A RESULT THE WHOLE TABLE WON'T BE
RESTORED):
2220	3	Faure	java.lang.String	\N
2221	3	Rosières	java.lang.String	\N
2222	3	Rosières	java.lang.String	\N
2223	3	Rosières	java.lang.String	\N
2224	3	Rosières	java.lang.String	\N
2225	3	Rosières	java.lang.String	\N
2226	3	Rosières	java.lang.String	\N
2227	3	Scholtès
2228	3	Scholtès
2229	3	Scholtès
2230	3	Scholtès
2231	3	Scholtès
2232	3	Scholtès
2233	3	Scholtès
2234	3	Scholtès
2235	3	Whirlpool	java.lang.String	\N

	As you can see, the string ended by 'ès' is quite lethal for Postgre. 
	The success of pg_dump depends on database content !
	It seems that any string ending by an accent followed by less than 2 characters
is a problem.
	
	Is it a known problem?
	Is it a database configuration problem or a real bug in Postgre?
	This problem is on my production database. I would appreciate If you could give
me an answer soon on that point.

Thanks in advance.
	Samuel Minne