I literally just downloaded the SV15 trial yesterday. The period has gone down 3 days every time I've opened the program, most of which has been done to troubleshoot a crash at startup. Now it's expired, 1 day later, and I've had no opportunity to try the software.
Not sure what you mean by SV, but if you are talking about Vegas Pro, you need to contact Magix about it. This is a user forum. Magix people come here occasionally, but this sounds like a major bug requiring their immediate attention.