The PC you are running it on likely has too old of graphics hardware. It has been known to happen. If updating the graphics driver does not fix it then there is no fix.
It will be a file "BlueIrisView_InstantReplayCache" located in the same folder as "BlueIrisViewer.jar". It will only happen if the instant replay feature is enabled.Hi. Where is the cache occurring when you run this? I don't see a file incrementing in the folder. I want to make sure it's happening on my hard drive as my normal Temp folder is on an SSD. Thanks.
Can you add video stream in addition to the static picture?It still works on the latest BI version so you are experiencing some other problem. Sometimes BIV creates a ton of sessions and causes Blue Iris to hit its session limit really fast (something like 100 by default I think) and I haven't been able to figure that one out. Closing BIV and starting it again after a few minutes should fix that...
You can also go to BI Options > Web Server > Advanced and in the "Limit IP addresses" box put ^127.0.0.1 (up arrow symbol followed by an IP address) to make it so all connections from that IP address get admin privilege without even having to log in. That might help.