This happened awhile back, then for no apparent reason the problem disappeared. Now it's back. For months SSDR works fine, then today I fire things up. Screen pops up normally and I have tuning and audio, just no spectrum or waterfall display. A bit of troubleshooting and I find that if I turn my anti-virus s/w off, the display and waterfall reappear and SSDR runs normally, although running without A/V SW bugs me, so I decide to write an exception in the A/V SW for the Flex software. This normally works with other programs, but not this time. Anyone have this issue with SSDR and Vipre Anti-Virus SW?