Works very smoothly with me. Of course, with the exception of the dreaded 100,000 captcha with each data request. But no, it does return results for me and doesn't shutdown.
I actually very recently used it to grab some keywords and the data was quite accurate, I ranked decently and had (and still am having) a couple of sales a week from one article. So as far as data accuracy, I think it's still good.
On WF, a staff member of MNF said they are aware of the captcha problems and are working on potential solutions, so we wait I guess.
"Always says blocked" looks like your IP is frowned upon. Tried using SOCKS proxies, reinstalling the application maybe?
Sorry I couldn't be of much help.