I will be removing spaces and miscellaneous punctuation (basically anything besides underscores and hyphens) from usernames soon. If you'd like to modify your name manually before that happens, let me know ASAP.
When I use blockquote rel="username". I used to be able to use spaces in the quotes and the blockquote worked fine. Now it seems that if I use rel="firstname lastname", the blockquote breaks. Is this related removing spaces from usernames?
No, this is a change in how the Quotes plugin works. Ironically, it was changed to increase compatibility with foreign languages but seems to have limited it to "real" usernames now. Hrm. Not sure what to do about that.
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Good call @Lincoln!