Hi @sintmacro,
That sounds like it might have to do with a plugin or theme conflict.
Could you try switching to a default theme like Twenty Thirteen and checking how it works then?
If it still doesn’t work, you could then try deactivating other plugins and testing then.
If it works with that (it really should), then you could try re-activating plugins one-by-one to find where the conflict is occurring.
Could you let us know how that works for you?
Thanks,
David