2.3.18 - wamp problems

I've just installed v2.3.18 on wamp server (windows 8 64bit).
* most of items works fine but some items doesn't work :
Sales - > Direct Delivery
Sales - > Direct Invoice
and some other...

I've tested with wamp 2.2 64bit / 32bit  and wamp 2.4 64bit / 32bit
when i wait long time for response, it loads the page incomplete!

But when i install on iis and mysql 5.5 from microsoft web installer everything works fine!

Thank you