If LW is running well with the versions of Java & LW that you have now then that's good

Every version of LW behaves a little differently & sometimes people have troubles with one particular version. People might have connection problems, firewall issues, trouble opening the program, compatibility issues with other software where there weren't any before (when running a different version).

If you think 4.14.8 is buggy, there's a 'Bugs & Beta Testing' section over at this other forum...some of the developers spend time there
Bugs and Beta Testing - LimeWire Forums

If you are seeing the firewall icon (brick wall) in LW then it's probably due to the firewall in your router. Keep in mind that if you're firewalled, other people will have a hard time downloading from you. If you want to get rid of that firewall, port forwarding's the way to go...just keep it in mind & you want to have a go at that in the future!