I upgraded to the latest version and same thing.
If I run it as a service I can't run hardware acceleration because there is a bug with Win7 AND HW acceleration. I'm lucky, I'm running less than 20% CPU with acceleration disabled and memory usage stays constant at around 680mb. As soon I turn off running it as a service and turn on hardware acceleration, the server lives about 65 minutes and then dies due to a massive memory leak.
Blue Iris support told me in response to not being able to run Win7 and HWA that he was focused on Win10 which truely sucks. I REALLY don't want to upgrade to Win10.