Changes have been made in Git for this ticket:

Bug #9313: Fix logintask confirmation
Session data type might change - if it changes from array/object to
scalar, remove the typehint declaration stored in the session.

Possibly fixes Bug #9324
Possibly fixes Bug #9325

http://git.horde.org/diff.php/framework/Core/lib/Horde/Session.php?rt=horde-git&r1=0ab36983a478f9137f04e428f85ccd389e617710&r2=6d69e71624b0a9bcc47b62d64c4f0e002b64fbe0

services/logintasks.php prior to the $tasks->runTasks() call:

Array ( [horde] => 1 [ansel] => 1 [ingo] => 1 [turba] => 1 [jonah] => 
1 [nag] => 1 [whups] => 1 [timeobjects] => 1 [kronolith] => 
Horde_LoginTasks_Tasklist Object ( [target] => [processed] => 1 
[_tasks:protected] => Array ( [0] => 
Kronolith_LoginTasks_Task_PurgeEvents Object ( [active] => 1 [display] 
=> 2 [interval] => 5 [priority] => 2 ) ) [_stasks:protected] => Array 
( ) [_ptr:protected] => 1 ) )


after the call:
Array ( [horde] => 1 [ansel] => 1 [ingo] => 1 [turba] => 1 [jonah] => 
1 [nag] => 1 [whups] => 1 [timeobjects] => 1 [kronolith] => 
Horde_LoginTasks_Tasklist Object ( [target] => [processed] => 1 
[_tasks:protected] => Array ( [0] => 
Kronolith_LoginTasks_Task_PurgeEvents Object ( [active] => 1 [display] 
=> 2 [interval] => 5 [priority] => 2 ) ) [_stasks:protected] => Array 
( ) [_ptr:protected] => 0 ) )

I don't see this.

Output of the session variables holding the logintasks data would be 
useful.  Can be obtained via:
print_r($GLOBALS['session']['horde:logintasks/']);

Either skipping or attempting to run a login task will result in 
reloading the login task confirmation screen. i.e. you can't get past 
this screen. No errors in log. Related horde log entries below:

2010-10-17T16:46:16-04:00 NOTICE: HORDE [imp] Login success  for mike 
[127.0.0.1] to {prod.theupstairsroom.com:993} [pid 180 on line 168 of 
"/usr/local/horde/horde/imp/lib/Auth.php"]
2010-10-17T16:46:16-04:00 DEBUG: HORDE [imp] Horde_Prefs: Storing 
preference value (last_logintasks) [pid 180 on line 342 of 
"/usr/local/horde/horde/framework/Prefs/lib/Horde/Prefs.php"]
2010-10-17T16:46:16-04:00 DEBUG: HORDE [imp] Max memory usage: 5767168 
bytes [pid 180 on line 433 of 
"/usr/local/horde/horde/framework/Core/lib/Horde/Registry.php"]
2010-10-17T16:46:16-04:00 DEBUG: HORDE [imp] SQL  (0.0003s)
        SELECT 1 FROM horde_prefs WHERE pref_uid = 'mike' AND pref_name =
          'last_logintasks' AND pref_scope = 'horde' [pid 180 on line 761 of 
"/usr/local/horde/horde/framework/Db/lib/Horde/Db/Adapter/Base.php"]
2010-10-17T16:46:16-04:00 DEBUG: HORDE [imp] SQL  (0.0006s)
        UPDATE horde_prefs SET pref_value =
          'a:8:{s:5:\"_once\";a:10:{i:0;s:45:\"Turba_LoginTasks_SystemTask_Upgra
          deFromTurba2\";i:1;s:40:\"Turba_LoginTasks_SystemTask_UpgradePrefs\";i
          :2;s:45:\"turba_LoginTasks_SystemTask_UpgradeFromTurba2\";i:3;s:40:\"t
          urba_LoginTasks_SystemTask_UpgradePrefs\";i:4;s:45:\"horde_LoginTasks_
          SystemTask_UpgradeFromHorde3\";i:5;s:41:\"imp_LoginTasks_SystemTask_Up
          gradeFromImp4\";i:6;s:45:\"whups_LoginTasks_SystemTask_UpgradeFromWhup
          s1\";i:7;s:53:\"kronolith_LoginTasks_SystemTask_UpgradeFromKronolith2\
          ";i:8;s:40:\"turba_LoginTasks_SystemTask_UpgradeLists\";i:9;s:45:\"imp
          _LoginTasks_SystemTask_UpgradeFromImp4Auth\";}s:5:\"horde\";i:12873480
          64;s:5:\"ansel\";i:1287348064;s:5:\"whups\";i:1287098470;s:3:\"imp\";i
          :1287348376;s:5:\"mnemo\";i:1285516121;s:5:\"chora\";i:1286929387;s:6:
          \"wicked\";i:1287098099;}' WHERE pref_uid = 'mike' AND pref_name =
          'last_logintasks' AND pref_scope = 'horde' [pid 180 on line 761 of 
"/usr/local/horde/horde/framework/Db/lib/Horde/Db/Adapter/Base.php"]

2010-10-17T16:46:17-04:00 DEBUG: HORDE [imp] Horde is ready to perform 
the tasks checked below. Check the box for any operation(s) you want 
to perform at this time. [pid 180 on line 27 of 
"/usr/local/horde/horde/framework/Core/lib/Horde/Core/Notification/Hordelog.php"]
2010-10-17T16:46:17-04:00 NOTICE: HORDE [imp] Login success  for mike 
[127.0.0.1] to {prod.theupstairsroom.com:993} [pid 180 on line 168 of 
"/usr/local/horde/horde/imp/lib/Auth.php"]

2010-10-17T16:46:17-04:00 DEBUG: HORDE [imp] Saved compiled template 
file for 
"/usr/local/horde/horde/horde/templates/logintasks/logintasks.html". 
[pid 180 on line 246 of 
"/usr/local/horde/horde/framework/Template/lib/Horde/Template.php"]
2010-10-17T16:46:17-04:00 DEBUG: HORDE [imp] Max memory usage: 
21233664 bytes [pid 180 on line 433 of 
"/usr/local/horde/horde/framework/Core/lib/Horde/Registry.php"]