It sounds like you are diving in too deep before addressing the basics. You mentioned core dumps. What exactly is crashing? The runtime, the builder, or something else?
My recommendation is the following:
1. Don't use 126.96.36.199. Uninstall this version (including WLS) and install WLS 188.8.131.52 and F/R 184.108.40.206. There are numerous issues in earlier versions that have been corrected in 220.127.116.11.
2. I recommend moving off of Windows 8.1. For similar reasons to move to 18.104.22.168, Win 8.1 had a variety of issues (unrelated to Oracle) that seemed to have been addressed in Win 10.
3. Regardless of which Forms version you are using, you should always perform a compile_all pl/sql when generating your FMX files. This can be done in the builder or on the command line if using the command line compiler.
4. Ensure that you have a current JDK (64bit) installed in the Java 8 family. Be sure to remove old versions that are not needed.
Trying to analyze the content of a crash dump file is mostly pointless when you don't have the source code. The main point here is that something is crashing and it should not be. Starting with an investigation of the surrounding infrastructure is always the best first steps.