VM 2.9.5 admin error - no save made in product order

[nzed]

I just updated today to VM2.9.5 on J3.2.3.
I wanted to change Default product sort order settings on page /administrator/index.php?option=com_virtuemart&view=config on Product Order Settings tab but after clicking on Save button it goes to /administrator/index.php with a blank page and no saving was made.

[Milbo]

Please enable vmdebug. Or take a look in the logs.

[nzed]

PHP Fatal error: require(): Failed opening required '.../components/com_virtuemart/helpers/shopfunctions.php' in .../administrator/components/com_virtuemart/helpers/shopfunctions.php on line 1283

Looking at line 1283 I've found this:
if(!class_exists('ShopFunctionsF')) require(JPATH_VM_SITE.DS.'helpers'.DS.'shopfunctions.php');

[Milbo]

yepp, found also another, similar error there.

[nzed]

yepp, found also another, similar error there.

Would you please send me the changes you have made to get over these and let me explore others - if there are any  - before 2.9.6 comes out.
Thanks!

[jenkinhill]

2.9.6 was released yesterday.