This issue is very similar to an issue reported in ticket #1299, However, my install is not a Bitnami tracks stack, it is an Apache and Passenger install on a Ubuntu 12.04 machine using MySQL as the database.

The gentleman that opened ticket #1299 closed his ticket because after a reinstall the error seemed to go away. Since I am running a different setup, I am not sure that a reinstall might solve my issue.

I have attached a photo of the error to accompany some Firebug output.

Here is Post data provided by Firebug below the authenticity token, it looks as if all the relevant fields of data contain valid data, however, I will post below the Response data from Firebug which seems to indicate an empty data field.

POST DATA FROM FIREBUG:
context_name Online
project_name Bills
recurring_todo[daily_ever... 1
recurring_todo[daily_sele... daily_every_x_day
recurring_todo[descriptio... Pay Electric Bill
recurring_todo[end_date]
recurring_todo[ends_on] no_end_date
recurring_todo[monthly_da... 0
recurring_todo[monthly_ev... 5
recurring_todo[monthly_ev... 1
recurring_todo[monthly_ev... 1
recurring_todo[monthly_ev... 1
recurring_todo[monthly_se... monthly_every_x_day
recurring_todo[notes]
recurring_todo[number_of_...
recurring_todo[recurring_... monthly
recurring_todo[recurring_... 1
recurring_todo[recurring_... 0
recurring_todo[recurring_... due_date
recurring_todo[start_from... 02/17/2013
recurring_todo[weekly_eve... 1
recurring_todo[weekly_ret... s
recurring_todo[yearly_day... 0
recurring_todo[yearly_eve... 17
recurring_todo[yearly_eve... 1
recurring_todo[yearly_mon... 2
recurring_todo[yearly_mon... 2
recurring_todo[yearly_sel... yearly_every_x_day
tag_list

RESPONSE DATA FROM FIREBUG:
TracksPages.show_errors(html_for_error_messages());

function replace_form_with_empty_form() {
$('div.recurring_container').html(html_for_empty_form());
}

function add_recurring_todo_to_active_container() {
$('#recurring_todos_container').append(html_for_recurring_todo());
$('#new_recurring_todo').effect('highlight', {}, 2000 );
$('#recurring-todos-empty-nd').hide();
}

function html_for_recurring_todo() {
return "";
}

function html_for_empty_form() {
return "";
}

function html_for_error_messages() {
return "<div class=\"errorExplanation\" id=\"errorExplanation\"><h2>1 error prohibited this recurring todo from being saved<\/h2><p>There were problems with the following fields:<\/p><ul><li>Every other nth month may not be empty for recurrence setting<\/li><\/ul><\/div>";
}



Also I am including a link to the signup page on my Tracks install if anyone would like to recreate the error and determine if the feedback provided by Firebug is more helpful to you than what I posted above: http://twepeater.sytes.net/signup

Thanks in advance for any help in resolving this issue along with the earlier ticket I posted today. I would just try to reinstall with an earlier version, however, I have already invited other people to use this install and they have created accounts so I would like to be able to repair this install instead of attempting to reinstall this or an earlier version. Thanks.