Looks like the next ModBuddy error that creators of many mods, or mods with frequent updates, are going to hit is a Gateway Timeout error from the GameSpy server at http://civ5.sake.gamespy.com/SakeSto...sServices.asmx when trying to display the current list of mods with all their versions (ie just after the Tools -> Online Services login page).
Unfortunately ModBuddy's way of dealing with the timeout is to crash. Which is somewhat annoying as most of the information on this page (ie that pertaining to out of date versions) is useless anyway.
So, for the time being my main GameSpy/ModBuddy account is dead (again!)
Update: On further investigation this is being caused by a "maxReceivedMessageSize" overflow, the timeout is a symptom not the cause. The limit seems to be around 120 versions of mod(s) - although the exact number will vary depending on the length of the mod name, number of downloads and ratings.