quantity deicimals

And the two Tare Rate settings?

I have not used this shipping module but your shipping quotes do not appear to be able to manage the weight and settings that you are using ...
NOTE: from the post of your Configuration ... Shipping/Packaging ... I cannot tell what are your actual settings and what is the display text

As to the decimal issue, edit the class:
/includes/modules/shopping_cart.php

and around line 1241, what happens if you add the code in RED:

Code:

---

        if (false && $new_qty == (int)$new_qty) {
          $new_qty = (int)$new_qty;
        }

---

NOTE: you may still get the message, but see if you can now get to checkout_shipping ...

Then to manage the error message, test this, I am not done testing this idea, but see how it works for you ...

Edit the file:
/includes/classes/shopping_cart.php

and add the code in RED:

Code:

---

          // Check Quantity Units if not already an error on Quantity Minimum
          if ($fix_once == 0) {
            $check_units = $products->fields['products_quantity_order_units'];
//            if ( fmod_round($check_quantity,$check_units) != 0 ) {
            if ( fmod_round($check_quantity,$check_units) != $check_units && fmod_round($check_quantity,$check_units) != 0) {
              $_SESSION['valid_to_checkout'] = false;
              $_SESSION['cart_errors'] .= ERROR_PRODUCT . $products->fields['products_name'] . ERROR_PRODUCT_QUANTITY_UNITS_SHOPPING_CART . ERROR_PRODUCT_QUANTITY_ORDERED . $check_quantity  . ' <span class="alertBlack">' . zen_get_products_quantity_min_units_display((int)$prid, false, true) . '</span> ' . '<br />';
            }
          }

          // Verify Valid Attributes

---

Check the IF as I had an error in it that I just fixed ...

tare settings *:1.00

That isn't a valid setting ... if you want to add 1lb to all your quotes, us:
0:1

I'll change it, but it does show 1 lb was added in cart

You might read through the file:
/includes/classes/shipping.php

and see how Tare Rates are calculated ... you would get some strange logic trying to use * as a value in the calculations ...

i Dont have A shopping_cart.php in that location.
did a search in catalog for that file and this is what was returned.

/var/www/clients/client1/web4/web/includes/auto_loaders/config.core.php

Line #25 : * require(DIR_WS_CLASSES . 'shopping_cart.php');

Line #63 : 'loadFile'=>'shopping_cart.php');

/var/www/clients/client1/web4/web/includes/auto_loaders/paypal_ipn.core.php

Line #34 : 'loadFile'=>'shopping_cart.php');

/var/www/clients/client1/web4/web/includes/init_includes/auto_loaders/config.core.php

Line #25 : * require(DIR_WS_CLASSES . 'shopping_cart.php');

Line #63 : 'loadFile'=>'shopping_cart.php');

/var/www/clients/client1/web4/web/includes/init_includes/auto_loaders/paypal_ipn.core.php

Line #34 : 'loadFile'=>'shopping_cart.php');

/var/www/clients/client1/web4/web/includes/languages/english.php

Line #104 : // shopping_cart box text in sideboxes/shopping_cart.php

/var/www/clients/client1/web4/web/includes/languages/english/info_shopping_cart.php

Line #19 : // $Id: info_shopping_cart.php 1969 2005-09-13 06:57:21Z drbyte $

/var/www/clients/client1/web4/web/includes/languages/english/shopping_cart.php

Line #6 : * @version $Id: shopping_cart.php 3183 2006-03-14 07:58:59Z birdbrain $

/var/www/clients/client1/web4/web/includes/languages/sheffield_blue/english.php

Line #104 : // shopping_cart box text in sideboxes/shopping_cart.php

/var/www/clients/client1/web4/web/includes/modules/quick_checkout_process/sideboxes/shopping_cart.php

Line #8 : * @version $Id: shopping_cart.php 7437 2007-11-16 21:33:16Z drbyte $

Line #33 : require($template->get_template_dir('tpl_shopping_cart.php',DIR_WS_TEMPLATE, $current_page_base,'sideboxes'). '/tpl_shopping_cart.php');

/var/www/clients/client1/web4/web/includes/modules/sideboxes/shopping_cart.php

Line #8 : * @version $Id: shopping_cart.php 7437 2007-11-16 21:33:16Z drbyte $

Line #33 : require($template->get_template_dir('tpl_shopping_cart.php',DIR_WS_TEMPLATE, $current_page_base,'sideboxes'). '/tpl_shopping_cart.php');

/var/www/clients/client1/web4/web/includes/templates/sheffield_blue/sideboxes/tpl_shopping_cart.php

Line #9 : * @version $Id: tpl_shopping_cart.php 7192 2007-10-06 13:30:46Z drbyte $

/var/www/clients/client1/web4/web/includes/templates/template_default/sideboxes/tpl_shopping_cart.php

Line #9 : * @version $Id: tpl_shopping_cart.php 7192 2007-10-06 13:30:46Z drbyte $

Do this ... forget the shopping_cart.php class file you cannot find ...

Change the file:
/includes/functions/functions_general.php

and replace the function fmod_round with this new code:

Code:

---

  // replacement for fmod to manage values < 1
  function fmod_round($x, $y) {
    $x = strval($x);
    $y = strval($y);
    $zc_round = ($x*1000)/($y*1000);
    $zc_round_ceil = round($zc_round,0);
    $multiplier = $zc_round_ceil * $y;
    $results = abs(round($x - $multiplier, 6));
    return $results;
  }

---

that worked, now is there a way to round up the weight to a whole number
517.8 ft = 899.998536, Would like it to be 900 lbs