tool login doesn't accept email address

[OneAndOnlyAwesome]

hi, 
the tool is telling me that my email address and password combination is invalid. 
I suspect that it is due to my address has a + in it.
working fine to login and use this forum.
I have had similar problems before. 

is my suspicion correct and is it fixable or do I need to use a different address?

Perhaps you could try encoding the + symbol.

So, use %2B instead of a +.

Just an idea.