I reinstalled the app, to no avail.
Running version 2.3.2 of Armory on Gingerbread 2.6.3
Server is Moon Guard,
Guild is Dominion of the Sun.
I've had the problem since Tuesday,
And as far as I can tell, switching to my text messages, leaving the Armory running in the background appears to be my catalyst for the issue.
No problems with any other aspect of the app, just the Guild Chat.
Hope the info helps.