Omnicomplete shows strange behavior when preview window is enabled

" load pathogen plugin
execute pathogen#infect()

" set mapleader to ","
let mapleader = ","

" set 256 Colors
set t_Co=256

" set colorscheme
colorscheme molokai

" set syntax highlighting
syntax on

" highlight cursors row and column
set cursorline
set cursorcolumn

" set auto indent on
filetype plugin indent on

augroup myvimrchooks
au!
" auto reload .vimrc
autocmd bufwritepost .vimrc source ~/.vimrc
" disable cursorcolumn in taglist view
autocmd VimEnter,WinEnter,BufWinEnter __Tag_List__ setlocal nocursorcolumn
" close preview window on movement in insert mode or when leaving insert mode
autocmd CursorMovedI * if pumvisible() == 0|pclose|endif
autocmd InsertLeave * if pumvisible() == 0|pclose|endif
augroup END

" enable mouse in console and GUI
set mouse=a

" show linenumbers
set number

" set makeprg for python -> TODO Only change when python file is loaded
set makeprg=clear&python2\ %

" set indentation to 2 space
set expandtab
set shiftwidth=2
set softtabstop=2

" ------------ Plugin specific ------------
"
" ------------ AutoCompletePop ------------
"
" Enable Preview Window
let g:acp_completeoptPreview = 1

" ------------ Taglist ------------
" TODO find a way to switch between tagview and last buffer
" Key binding for Toggle Taglist
nnoremap <silent> <Leader>tt :TlistToggle<CR>
nnoremap <silent> <Leader>tu :TlistUpdate<CR>

" ------------ NERDTree ------------
" Key bindings for NERDTree
nnoremap <silent> <Leader>n :NERDTree<CR>
nnoremap <Leader>w <C-W>w
Hi,

I'm currently investing some time learning vim and setting my .vimrc up. Doing
so I've come across a problem I couldn't solve myself. I'm using the
AutoComplPop Plugin so that the Omnicomplete "Window" pops up automatically. I
also enabled the Preview Window through this command in my .vimrc

let g:acp_completeoptPreview = 1

But everytime the preview window pops up the Omnicomplete popup vanishes, In
large lists I am able to see the last entries in the status line. Even more
strange when i navigate in the invisible list an reach the " " entry alias
"Back at original" the whole list pops up and is visible.

I allready changed the cholorscheme and switched to gvim but the error stays
the same.

I attached my .vimrc, I hope someone knows what the problem is.

Regards

Benjamin Isbarn

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