I'm having similar issues with my XP Desktop, as with my Win7 Laptop and it varies as to the extent of the problem....
As the browser to view the cam, I'm the latest version of Firefox. As either PC tries to load the picture from the cam, I often get a Application Blocked by Security Settings. Its the same whether looking in via my network or from outside remotely.
The login page comes up, I login, then see this pop up.....
Application Blocked by Security Settings
Name A Location (my cameras IP address)
Your security settings have blocked an application from running with an out-of-date or expired version of Java.
I have tried updating Java numerous times on both PC's, but it seems to fail.
I usually get to the picture by clicking OK, once, sometimes several times.
Anyone know of the fix please?