Hallo,
I have been using IVM 4.11 for 3 mounths with no problems. Now installing the product onto a new server (using card TELCURL4LV) I have found this
1) Tring to lead a message on a mailbox IVM disconnetes the call saying "Message too short 00:00 seconds). Ok I though that I've forgotten sono parameter and so I was comparing with version 4.11 setting.
2) After made some calls to IVM I get in fews minuts a disk full: 100Gbytes!!!!! I discovered IVM temporari file stored in c:\documents settings\user\local settings\temp as big as 93 GBYTES!!!!! 
Please NCH check this out because its very dangerous.
Fortunately I kept a installation filies of 4.11 version.... 
bye
Gianpaolo