[imp] Webmail is not activated

[Ralf Krüdewagen]

Hi,

after upgrading from latest Horde Webmail 5.1.x to 5.2.0, IMP is not 
activated.

I periodically get following PHP error (running PHP 5.5.14):

HORDE: [horde] imp is not activated. [pid 18399 on line 1531 of 
"/usr/share/php5/PEAR/Horde/Registry.php"]

HORDE: [imp] Horde_Prefs_Scope::serialize() must return a string or NULL [pid 
17712 on line 37 of "/usr/share/php5/PEAR/Horde/Pack/Driver/Serialize.php"]

and the Web GUI box says

    Webmail is not activated. 

Any idea?

I already forced an upgrade on all Horde components, e.g. to Horde_Core-2.12.4 
etc.

BTW: I also get a lot of other PHP errors, also related to turba:

HORDE: [turba] PHP ERROR: array_merge(): Argument #2 is not an array [pid 422 
on line 66 of "/usr/share/php5/PEAR/Horde/Regist
ry/Loadconfig.php"]

HORDE: [turba] PHP ERROR: Invalid argument supplied for foreach() [pid 15698 
on line 89 of "/usr/share/php5/PEAR/Horde/Core/Db
/Migration.php"]

Cheers
Ralf