In edit/add mode, Gcrud creates an input element like this:
<input id="field-testinteger" name="testinteger" type="text" value="51256" class="numeric" maxlength="10) unsigne"/>
The maxlength is all messed up... in my browser (Opera) this makes one unable to use backspace.
The problem probably lies in the model, function get_field_types_basic_table() ...where it tries to find the db_max_length.