Bug reports from anonymous users are now no longer allowed. You must register a SourceForge account and submit your bug report from there.
We receive a lot of anonymous submissions and sadly, a lot of them cannot be reproduced by a developer, or contain incomplete or ambiguous descriptions. In these cases, we need to contact the submitter in order to solve the problem. When the submitter is anonymous, it's impossible to contact them unless they come back and check the report, and in nearly all the cases I have seen, the anonymous submitter never returned to the bug report.
We'd rather these problems were fixed than left closed due to being incomplete, therefore, you must now submit from a registered SourceForge account.