Hey,
I had the same problem reported in this thread, but I would like to add that in my case, I had never changed my FICS prompt, and still couldn't login with my FICS user, using the the Magnus app.
So the solution I found was to change my prompt to something other than 'fics%' and then change it again to 'fics%'.
The step by step procedure is:
1. Login to your FICS account so that you can get an access to the console (for example with: http://www.freechess.org/Login…..pplet.php)
2. Type in the console:
set availinfo off
(this will stop displaying anoying data in the console, so you can concentrate on what you are doing)
3. Type in the console:
set prompt 'something%'
set prompt 'fics%'
4. Logout from your FICS account, and try to login wih the Magnus app.
@Magnus, I think this problem may become blocking to a lot of non-techincal people. And then you and your app credibility will lose credit, because some people may think they are paying multiple times for the same app.
Maybe you can just add a pop-up sign warning the user what to do (or pointing to a support page), until you have a solution for the problem.
Anyway, Best Regards and Congrats on the magnificent app