In the future – if you want to keep a meaningful title – you can use one of the following replacements for "Problem".

- Ρroblem *(with the greek capital letter Rho, Unicode 03A1)* 
- Problеm *(with the cyrillic small letter ie, Unicode 0435)*

Yes, this breaks title search, but at least it's readable and makes sense. Any you're able to edit the question.

This restriction is just meant to be circumvented. Reasons are already given in the post Daniel mentioned in the comments – [Let users with sufficient reputation use “problem” in titles](http://meta.stackoverflow.com/questions/108815/let-users-with-sufficient-reputation-use-problem-in-titles) – as well as several others: [Remove blacklist filter for `problem`](http://meta.stackoverflow.com/questions/110789/remove-blacklist-filter-for-problem)