In SmartClient 6.5.1 there exists a bug whereby in some circumstances a horizontally scrolled editable listGrid with a number of fields, including some which are canEdit:false can fail to show an editor for certain fields.

This patch should resolve this issue:

Code:
//----------------------------------------------------------------------------
// Isomorphic SmartClient 6.5.1 patch
// Purpose: Fix for a case where editors could fail to show for some fields when
// incrementally rendering out ListGrid columns if editing was disabled on other fields
// 
// Applies to SmartClient 6.5.1 build only
//----------------------------------------------------------------------------
if (window.isc && isc.version.startsWith("6.5.1/") ){

if (isc.ListGrid) {
isc.ListGrid.addProperties({
$32s: function (_1, _2) {
    var _3 = this.$30a;
    this.$30a = true;
    if (!this.isDrawn() || !this.body) {
        return;
    }
    var _4 = this.isEmpty() ||
        !_3 &&
        _1 >= this.data.getLength() &&
        (this.showNewRecordRow || this.body.getTableElement(_1, _2) == null);
    if (_4 ||
        this.body.isDirty() ||
        (this.frozenBody && this.frozenBody.isDirty())) {
        var _5 = this.bodyLayout ? this.bodyLayout : this.body;
        _5.redraw("Showing editor");
        return;
    }
    if (this.editByCell) {
        this.refreshCell(_1, _2);
    } else {
        var _6 = this.getDrawnFields();
        for (var i = 0; i < _6.length; i++) {
            var _8 = _6[i][this.fieldIdProperty], 
                _9 = this.$286.getItem(_8), _2 = _9.colNum, _10 = !!(_3 && _9.isDrawn()), 
                _11 = this.canEditCell(_1, _2);
            if (_10 != _11) {
                this.refreshCell(_1, _2);
            } else if (this.selectOnEdit || this.lastOverRow) {
                this.body.$29h(this.getCellRecord(_1, _2), _1, _2);
            }
        }
    }
}
});
}


} else if (window.isc) {
  isc.Log.logWarn("Patch for SmartClient 6.5.1 build included in this application. " +
            "You are currently running SmartClient verion '"+ isc.version + 
            "'. This patch is not compatible with this build and will have no effect. " +
            "It should be removed from your application source.");

}

// End of patch
// ------------