(Solved) Problems with database backups after 1.07 rc1 update

[Smallserver]

Edit: it was a permissions issue in /tmp (755 must be 777 (ispcp couldn't write there))

Hi there,

Since my upgrade I get the following error via email, on all my databases"

Dear admin,

I'm an automatic email sent by your server.harperink.de
(213.239.193.22) server.

A critical error just was encountered while executing function
backup_ispcp_database() in
/var/www/ispcp/engine/backup/ispcp-backup-ispcp.

Error encountered was:

=====================================================================
ERROR: Failed to backup database ispcp!
=====================================================================

Any clue where to look?
Debian Lenny, ispCP 1.0.7RC1

Grtz,
Herman