Fuze has more issues than anyone would like, including us. Some get fixed with every new release but sadly when new features come along some more issues inevitably creap in. This is far from ideal.
If you have any reproducable cases that can be demonstrated by small snippets of code or small sets of instructions ("do this, then that, then that") then please report them in the bug reporting section, we can then get them on the issue list and get them looked at.