[imp] IMP folder issues - JavaScript error

[Daniel Bramkamp]

Hello,

we are experiencing some issues with IMP 4.2 RC-1 with folders. Some  
users can create new folders, others cannot. For those that cannot the  
issue is, that the popup asking for the name of the folder that is to  
be created does not popup at all. The other functions for managing  
folders, like rename, etc. do not work either. The Firefox Error  
Console shows this error if I switch to the folder page:

Error: $("checkAll1") has no properties
Source: https://172.16.128.6/horde/imp/js/folders.js
Line: 1

Using Internet Explorer instead of Firefox leads to the same issue.  
Creating folders work if I use Thunderbird for example.

If more information is needed, I will happily provide it.

Help would be much appreciated.
Thanks in advance
-- 
Daniel Bramkamp