First of all, Mr_Smurf, you have a typo in the install file,
#_{vm}_bills instead of
#__{vm}_bills.
That's okay, I found it, corrected it.
Installed the latest version - read forum

and here I am!
I have the new tab, with the new fdelivery button and the header of the tab. I can click on new delivery

more, the dialogue appears, I have the chance to change the nr of items to be delivered and 2 checkboxes below:
Customer has prepaid the order.
Create invoice
The Invoice is due x days. Delay interest x % boxes are grayed out, and I have two more choices: Cancel and Save. And here the fun begans: I can click on any og these, the result is the same: nothing changes.
I can even set the deliverables amount of any number I like, not even an error message is showing up.
I'm running VM 1.01 on top of the Joomla 1.04, site not installed in the webroot, but in a subdir, I tried to use the hack from a wide range of clients, on '98 and XP (IE, Mozilla, FireFox, Opera, whatewer you like). Databases are created, in place, all files patched, double-checked. And I'm not a beginner...
What I'm doing wrong?