maybe you're inserting them in the wrong format or it can be that those proxies aren't good for the sites where you're trying to use them, perhaps some kind of auth problem etc.
i'm not particularly familiar with any of those tools, but if they're at least half decent, they need to have log, which tells you exactly the type of error you're having, so you can ask the support of the tools referring to the exact error message or maybe post here the exact error message you're getting, so others who own the tools can help