Wrong handle the variable

The Database Navigator Editor wrong handled the variable. If the variable is called like 'PATH' - the strange behaviour and I can't debug and work. If I the variable is called like 'PATH_1" - all fine. Please, ask me about your thoughts. Since I can't work with this tool so far. In the others tools, all works fine. I'm trying to edit the already existing procedure in the oracle. The Database Navigator version is 3.0.7248.1