Yeah I recognized the same issue running up on the latest offical ocsinventory-ng.
I just testet an application for deployment and here's the info file from my debian machine:
<?xml version="1.0" encoding="UTF-8"?>
<DOWNLOAD ID="1454424497" PRI="5" ACT="EXECUTE" DIGEST="67bf83af1c43d429a7bc68f9f15f4682" PROTO="HTTP" FRAGS="1" DIGEST_ALGO="MD5" DIGEST_ENCODE="Hexa" COMMAND="xxxx_without_Driver.exe /S" NOTIFY_USER="1"NOTIFY_TEXT="Achtung:
xxxxxx wird nun installiert!" NOTIFY_COUNTDOWN="900" NOTIFY_CAN_ABORT="0" NOTIFY_CAN_DELAY="1" NEED_DONE_ACTION="0" NEED_DONE_ACTION_TEXT="" GARDEFOU="rien" />
As you can see there's a NOTIFY_TEXT definded but on the endpoint the client message is not displayed.
Should I mention that I'm using the official builds listed on http://www.ocsinventory-ng.org/en/download/download-server.html
I saw the gitub repos and the new server and client agents on https://github.com/OCSInventory-NG - will give it a try with the most recent packages, ok?