Never able to reproduce, and basic view has been removed in git master.

It's not easy for me to debug it.

I use php version 5.3.28.

It was OK in version 6.1.2.

Move message is working from message list and not working from full 
view of message.

I was try find some differences in POST in full view and list view.
Is it help for you to find where problem is?

Error:

URL: /horde/imp/basic.php?page=message
POST DATA:
targetMbox=SU5CT1guT2xk&actionID=move_message&buid=141327&token=MNg4EFG57SPIu6E_1P9rqQ1&mailbox=SU5CT1g&start=8&newMbox=&flag=&mailbox=SU5CT1g&target1=SU5CT1guT2xk&mailbox=SU5CT1g&target2=SU5CT1guT2xk

actionID        move_message
buid        141327
flag
mailbox        SU5CT1g
mailbox        SU5CT1g
mailbox        SU5CT1g
newMbox
start        8
target1        SU5CT1guT2xk
target2        SU5CT1guT2xk
targetMbox        SU5CT1guT2xk
token        MNg4EFG57SPIu6E_1P9rqQ1


Good:

URL: /horde/imp/basic.php?page=mailbox
POST DATA:
mailbox=SU5CT1g&token=MNg4EFG57SPIu6E_1P9rqQ1&mpage=1&actionID=move_messages&targetMbox=SU5CT1guT2xk&newMbox=0&flag=&filter=&buid%5B%5D=141318

actionID        move_messages
buid[]        141318
filter
flag
mailbox        SU5CT1g
mpage        1
newMbox        0
targetMbox        SU5CT1guT2xk
token        MNg4EFG57SPIu6E_1P9rqQ1

These are the steps I took originally, and I cannot reproduce.

Basic view is deprecated so without further debugging on your part (or 
someone else who can reproduce), this most likely won't be fixed.

How to reproduce:

- login into horde/imp in Basic mode
- open the message by clicking on subject
- select any folder in top menu "Move, copy"
- click to Move in the top menu

Unable to reproduce the behavior reported.  It may very well be a bug, 
but without a way for a developer to reproduce there will 
unfortunately be no further action on this ticket.

Ideally, you need to debug the code yourself and report exactly why 
the code is not working for you.  Backtraces are extremely helpful and 
can be generated via Horde::debug (see 
http://wiki.horde.org/Doc/Dev/Debug).

The following information may also be helpful:

1. If you have not already done so, provide a step-by-step method on 
how to reproduce on your system.  (If you have done so, you may need 
to be more exact, as the developer was unable to reproduce given your 
current steps.)
2. Provide the relevant portions of config files - only the config 
items that correspond to the issue reported.
3. The PHP version.
4. Full debug logging from Horde (set $conf['log']['priority'] to 
'DEBUG' in horde/config/conf.php).
5. Error logging from PHP.

There is error when I can move message to any folder in full message 
view on Basic mode.

I got this error:

Fatal error: Call to a member function getFlags() on a non-object in 
/var/www/html/horde/imp/lib/Maillog/Storage/Mdnsent.php on line 68

Fatal Error

Call to a member function getFlags() on a non-object
1. Horde_ErrorHandler::catchFatalError()
Details
The full error message is logged in Horde's log file, and is shown 
below only to administrators. Non-administrative users will not see 
error details.
ErrorException Object
(
     [message:protected] => Call to a member function getFlags() on a 
non-object
     [string:Exception:private] =>
     [code:protected] => 0
     [file:protected] => 
/var/www/html/horde/imp/lib/Maillog/Storage/Mdnsent.php
     [line:protected] => 68
     [trace:Exception:private] => Array
         (
             [0] => Array
                 (
                     [function] => catchFatalError
                     [class] => Horde_ErrorHandler
                     [type] => ::
                     [args] => Array
                         (
                         )

                 )

         )

     [previous:Exception:private] =>
     [severity:protected] => 1
     [logged] => 1
)