Using iStraxx Download Plugin for media for Sale v2.4.10 (purchased recently)
The language string for VMCUSTOM_ISTRAXX_DOWNLOAD_OUTTA_DATE is missing in the language files, EXCEPT for de-DE and it-IT
I have set the en-GB definition as "The current date is not inside a valid time window".
Please update your software.
For support & reports on iStraxx extensions use the ticket system. http://extensions.virtuemart.net/support-updates