[imp] Lots of Warnings in horde.log

[Karsten Schlimme]

Hi everybody!

I just finished my first Horde (webmail edition) install on Ubuntu  
12.04. After I had some problems with changing the language (I had to  
add my wanted language and do a "|dpkg-reconfigure locales") and with  
ActiveSync (I had to manually choose every folder for syncing at the  
client), my only problem are lots of warnings in the horde.log. After  
15 minutes there are ~2000 new warnings, most of them look like this:

2014-01-21T17:56:27+00:00 WARN: HORDE [imp] PHP ERROR: array_map():  
Argument #2 should be an array [pid 3581 on line 706 of  
"/usr/share/php/Horde/Imap/Client/Base.php"]

..only the pid changes. Every 8th of those warnings is followed by:

2014-01-21T18:25:53+00:00 WARN: HORDE [imp] PHP ERROR: array_filter()  
expects parameter 1 to be array, null given [pid 6659 on line 719 of  
"/usr/share/php/Horde/Imap/Client/Base.php"]
2014-01-21T18:25:53+00:00 WARN: HORDE [imp] PHP ERROR: array_diff():  
Argument #1 is not an array [pid 6659 on line 719 of  
"/usr/share/php/Horde/Imap/Client/Base.php"]

I'm using Horde 5.1.5||and PHP 5.3.10-1ubuntu3.9, loglevel is INFO,  
let me know if you need more infos. :)

Best regards,

Karsten

PS: In Administration > Configuration, only 9 modules are "ready" and  
have symbol in front, is that normal? I'm asking because eg.  
"Horde_ActiveSync" has no "is ready" but is in use.

Link zu screenshot of module page in horde:  
https://schlimme.net/horde_modules.png