1.5.10 grid upgrade error

Hi.
I've installed the new card & table extensions (v1.5.10) over the old 1.5.8 version and some errors occurred.
First of all, all the chosen columns in already defined grids are all deselected (I noticed the same problem in 1.5.9 version).
More worrying problem, in existing grids and when I try to create a new grid, severe errors appear:

in the page header:

Notice: Undefined variable: customLink in mypath\administrator\components\com_grid\models\grid.php on line 398
Notice: Undefined property: stdClass::$default_order in mypath\administrator\components\com_grid\models\grid.php on line 403
Notice: Undefined offset: 1 in mypath\administrator\components\com_grid\models\grid.php on line 405
Notice: Undefined property: stdClass::$secOrder in mypath\administrator\components\com_grid\models\grid.php on line 408
Notice: Undefined offset: 2 in mypath\administrator\components\com_grid\models\grid.php on line 409
Notice: Undefined offset: 1 in mypath\administrator\components\com_grid\models\grid.php on line 410
Notice: Undefined offset: 1 in mypath\administrator\components\com_grid\models\grid.php on line 418
Notice: Undefined property: stdClass::$filter in mypath\administrator\components\com_grid\models\grid.php on line 424
Notice: Undefined offset: 1 in mypath\administrator\components\com_grid\models\grid.php on line 426
Notice: Undefined property: stdClass::$graphConfig in mypath\administrator\components\com_grid\models\grid.php on line 429
...
Notice: Undefined property: stdClass::$connection in mypath\administrator\components\com_grid\models\grid.php on line 133
Notice: Undefined variable: _DB in mypath\administrator\components\com_grid\models\grid.php on line 154
..
Notice: Undefined property: stdClass::$tableName in mypath\administrator\components\com_grid\models\grid.php on line 173
Notice: Undefined property: stdClass::$connection in mypath\administrator\components\com_grid\models\grid.php on line 174
Notice: Undefined property: stdClass::$idGrid in mypath\administrator\components\com_grid\views\grid\view.html.php on line 33

in Connection (only for new grids):

Notice: Undefined property: stdClass::$connection in C:\Programmi\EasyPHP 3.0\www\www_test\aikikai\administrator\components\com_grid\views\grid\tmpl\editform.php on line 100
checked onclick="enableConn()"/>

in Search Form:

Notice: Use of undefined constant display - assumed 'display' in mypath\administrator\components\com_grid\views\grid\tmpl\search.php on line 16
Notice: Use of undefined constant display - assumed 'display' in mypath\administrator\components\com_grid\views\grid\tmpl\search.php on line 18

Please help!

P.S.: installation done on Joomla 1.5.23

tomaz wrote:
Well.. I tried the following steps:

1) installing 1.5.8 over the 1.5.10, installing the 1.5.9 after that and at the end installing 1.5.10 again

2) uninstalling 1.5.10, then installing 1.5.8, 1.5.9 over the previous one and at the end installling 1.5.10

In both cases, errors didn't disappear: I checked the situation after every installation (so I chechked after 1.5.8 installation, after 1.5.9 installation and after 1.5.10 installation in both cases 1) and 2)), but the errors were still present.

How can I solve now the problem? Perhaps with the update package? If possible, I would like not to delete all the grid I have defined.

Thank you for your support and best regards,

Marco