What steps will reproduce the problem?
1. Select some new event.
2. Mark yourself as "Maybe attending"
3. Click done
4. Reopen the event panel
5. The checkbox is reset to "yes" and not "maybe"

What is the expected output? What do you see instead?

The checkbox should have remained "maybe"

What version of the product are you using?

Present in both 4.4.1 and 4.5

Do you have an error log of what happened?

No

Please provide any additional information below.

I tracked this to a function named GroupCalendar._EventViewer:GetStatusFromControls()

The return code for self.Widgets.EventFrame.Maybe should be 'M' and not 'S'. I am not sure if 'S' is used for some special purpose here, but the code around line 282 changes the status to 'Yes' if it was 'S'. I am not sure if this is supposed to be a feature, but its really annoying because, when the status is reset, a new confirmation for the event attendance has to be made.

I am not posting a patch, cos it is really trivial - on line 387 (v 4.5) change 'S' to 'M'.