I have updated Java SDK so that now it is at C:\Program Files\Java\jdk1.8.0_74\bin\javac.exe. I have also increased the timeout from 30 to 120 s. No avail.
I shall note yet another new phenomenon: "Installing file to device" takes now very long time. The simplest CheckPhone app takes 47 sec to load, and it is the same with both debuggers.
I have created an empty new project, but it also does not work with the rapid debugger. Again, it works with the legacy, but in a strange way. As if the IDE starts the app and then loses the control of it: the program ignores breakpoints and cannot be stopped by the IDE. Even if you close the B4A on Windows, the app continues running.
Based on the description it looks like there is a network problem that prevents the debugger from connecting to the device. It works in the legacy debugger because the legacy debugger can work without a network connection (similar to running in release mode).
The firewall or anti virus are maybe blocking the connection.
1. Please note that the legacy debugger is also not working properly, so I can't use it as a workaround.
2. I stopped both the antivirus and the firewall on my computer, but it did not help.
3. I tried the B4A-Bridge. Same phenomenon: the app is installed and started, then a message appears, "Waiting for IDE debugger to connect" and then the app crashes.
Tried it today on my ancient XP laptop, with the same version of B4A and of the antivirus, and it worked! What shall I check/do to make it work again on my Win8 workstation?