KIGRPS-121205: Why am I getting a "Scheduled Maintenance" message when trying to view my calendar?

Our group has been experiencing this problem for a couple of days. Additionally, after briefly being able to access the calendar this morning, when trying to make a calendar event change, I received this message:

"Sorry, we are experiencing technical difficulties. Please wait for a few moments and try again. Error code:1111"

And then the calendar page went back to the "maintenance" message.

Update: Now receiving this message when clicking on the calendar link from the sidebar:

We're experiencing some technical difficulties...

We’re sorry, but Yahoo! Mail can't load due to a temporary error. You can try back again shortly, or visit our help pages for ways to troubleshoot the issue.

Try again

Visit Help for troubleshooting instructions

Temporary error: 103

This is not an exhaustive list of all of the groups I belong to. These are just from my first page of groups, and many of those do not have the calendar enabled. The ONLY one that did have the calendar enabled and did not have an error message when viewing it was the Zymurgy group.

Edit: Update--I went back to check and the Zymurgy group calendar is now showing the scheduled maintenance bug message. My guess, based on my sampling, is that this is a widespread issue. Some groups have the calendar but don't use it, and you won't likely hear from anyone in those groups unless they're checking for this error. In my sampling, every group I belong to that I checked and had the calendar enabled had one or the other error message on the calendar page. Zymurgy didn't the first time, but when revisiting the calendar there, it showed the error.

These groups are affected with the "scheduled maintenance" bug:

Paperport

BrewingEquipment

Amateur-repairs

chillicothefreecycle

eh-antenna

Zymurgy

These have the "We're experiencing some technical difficulties" bug:

Grow-Hops

sobfarleytest

AnHerbGarden

blackberry-users (also had an error on the edit membership page)

CatVet

Our Group has not been able to access the Group Calendar for several days now.

http://groups.yahoo.com/group/karcgroup/

Also when refreshing I get the following error...

We're experiencing some technical difficulties...

We’re sorry, but Yahoo! Mail can't load due to a temporary error. You can try back again shortly, or visit our help pages for ways to troubleshoot the issue.

Try again

Visit Help for troubleshooting instructions

Temporary error: 103

DESCRIPTION: My moderator & myself (owner) have been trying for a couple weeks to get into the calender to change the dates, but have been unable too. We have been getting and error message about a "Scheduled Maintenance".

CURRENT STATUS: As of this evening I got a different error message: Temporary Error 103. That's it.

Please, we need to get the information changed for we have members showing up for a meeting that isn't being held at the time stated on the calendar. Please let us know when this issue is fixed, thank you, Becky Ruble owner of the Muggs Non Muggles/Pagans in the Park Group.

I have been getting this message for at least the last 24 hours.

My group http://groups.yahoo.com/group/m-eastanglia/

When I view the group calendar from my personal calendar I notice that several events now occur twice.

I am receiving the following message when I attempt to access the calendar in my yahoo group, Forever Pugged, http://pets.groups.yahoo.com/group/ForeverPugged

Description: Could not connect to the server "calendar.yahoo.com".

The Mayan's predicted this.