I have noticed that the last couple of patches, and the few server crashes in the last few weeks have resulted in the Guild log being deleting all new entries. After today's patch, the last log entry is 17 days ago, which is completely false as I have been working on achievements for a bit and the log was full of them. While this is not a huge thing, it points to an underlying issue that may be indicative of other failures that is going on behind the scenes.