The sentence didn't appear but then I opened the report box where the sentence appears. After that, get a new word button doesn't stop reloading. After I reloaded the page, it became normal.
There appears to be some kind of conflict between しろ the noun and the stem of しろい the adjective. That might not be the root cause of this behavior, but it could be a contributing factor.
It's weird - I just didn't see anything in the sentence data that I thought could cause it. The reparse might have caught something I didn't see, though.