I upgraded to NetObjects 2015 a couple of weeks ago, and everything has been working fine until today. Each time I have tried to open any page I get a message "JDK not installed". When I click "OK" the program closes down. When I open the program again I get an unstable file message. After a message that it has recovered successfully and I try again to open a page, I get the same message as above.

I have tried downloading the upgrades for the program, but that didn't solve the problem. I have been using earlier versions of NetObjects for many years and have never experienced similar problems.