Here's a screenshot of what the guild history screen looks like after today's maintenance:

I manage a 500-member trading guild and this is a fairly large issue for us as we collect donations to support our guild trader bid and credit the people who donated as contributing to our guild. Without the guild history, we can't do this.
I do have a record kept offline of this data from before the maintenance, but anyone who's contributed since then appears to be lost. If possible, please fix this.