Version 4.0.3 contains a wrong variable name in the compacted version in line 45.
instead of $l it should be $g in the English version and $h in the general.
The error is:
Fatal error: Call to a member function quote() on a non-object in D:...\Adminer\adminer-en.php on line 45
and happens when I click on a table.
When I change it manually it works fine.