When I use multiple valuta ( EUR standard valuta, USD order currency) then the plugin gives the following error:
malformed header from script. Bad header=No recipients were listed.: index.php

Removing the order with the different currency (in my case USD) all works fine.

I'm using the latest versions:

VM invoice: 1.4.2
JoomSef : 3.7.6

Hello,

please, try to turn on error reporting to maximum level in Joomla in order to see if there is any error message appearing.

Didn;t give more info...
Fatal error: Call to undefined method CurrencyDisplay::getinstance() in /var/www/administrator/components/com_vminvoice/helpers/invoicehtml.php on line 51
(on screen)

And in the error log still the same:
malformed header from script. Bad header=No recipients were listed.: index.php

The cronjob gives also an error 500:
GET /?option=com_vminvoice&task=cronMail&view=vminvoice HTTP/1.0" 500 544 "-" "Wget/1.10.2"

I've checked all files including the plugin, it;s the latest version 1.4.2

Hello,

really strange. I would probably recommend comple uninstall of both VM Invoice and its plugin, checking that there are no file left and reinstalling from scratch.
Maybe the update has failed somehow in your case.

Alternativelly, before doing so, you make unzipping the installation package and manually replacing all files in the frontend and backend part incl. the plugin code.

Didn't help, This is what I have done:

1. manually re-install all the files from the original 1.4.2 package (also the database tables, as in the xml file)
(result: same error)

2. Completely remove all files and database tables of vminvoice
(result: same error)

3. Complete remove my test server (including database) and reinstall (from current backup) from my production server (Joomsef installed, vminvoice has never been installed).
- install vminvoice
Now when creating a PDF from the admin menu it give this error:
Cannot modify header information - headers already sent by (output started at /var/www//libraries/joomla/html/parameter.php:83) in /var/www//administrator/components/com_vminvoice/tcpdf/tcpdf.php on line 8073
TCPDF ERROR: Some data has already been output to browser, can't send PDF file.

* I have search the forums for this error, but couldn't find anything relevant.
* I have tried everything with joomfish and languages

Hello,
I am afraid I cannot help you any further remotelly. Would it be possible to get FTP access to the site to be able to test and debug this?
If so, please, send the access information to Diese E-Mail-Adresse ist gegen Spambots geschützt! Du musst JavaScript aktivieren, damit Du sie sehen kannst. .