Hello,

For a specific file that I am making with org column view with
TaskJuggler, the column header in the column view disappears after
scrolling down.

To re produce this issue, please:
1. copy the file content to an org file
2. start col view in first header 'building'
3. scroll down for some time, then scroll up.

PFA: attached file where I am facing the issue.


FYI:
Emacs  : GNU Emacs 26.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 2.24.32)
 of 2018-06-10
Package: Org mode version 9.0.5 (9.0.5-elpa @
/home/aritra/.emacs.d/elpa/org-20170210/)

current state:
==============
(setq
 org-src-mode-hook '(org-src-babel-configure-edit-buffer
org-src-mode-configure-edit-buffer)
 org-after-todo-state-change-hook '(org-clock-out-if-current)
 org-metadown-hook '(org-babel-pop-to-session-maybe)
 org-clock-out-hook '(org-clock-remove-empty-clock-drawer)
 org-mode-hook '(org-table-sticky-header-mode er/add-org-mode-expansions
         #[0 "\300\301\302\303\304$\207" [add-hook change-major-mode-hook
org-show-block-all append local] 5]
         #[0 "\300\301\302\303\304$\207" [add-hook change-major-mode-hook
org-babel-show-result-all append local] 5]
         org-babel-result-hide-spec org-babel-hide-all-hashes)
 org-archive-hook '(org-attach-archive-delete-maybe)
 org-confirm-elisp-link-function 'yes-or-no-p
 org-agenda-before-write-hook '(org-agenda-add-entry-text)
 org-metaup-hook '(org-babel-load-in-session-maybe)
 org-babel-pre-tangle-hook '(save-buffer)
 org-tab-first-hook '(org-babel-hide-result-toggle-maybe
org-babel-header-arg-expand)
 org-export-backends '(taskjuggler ascii html icalendar latex odt)
 org-occur-hook '(org-first-headline-recenter)
 org-cycle-hook '(org-cycle-hide-archived-subtrees org-cycle-hide-drawers
org-cycle-show-empty-lines
          org-optimize-window-after-visibility-change)
 org-speed-command-hook '(org-speed-command-default-hook
org-babel-speed-command-hook)
 org-confirm-shell-link-function 'yes-or-no-p
 org-link-parameters '(("id" :follow org-id-open) ("rmail" :follow
org-rmail-open :store org-rmail-store-link)
               ("mhe" :follow org-mhe-open :store org-mhe-store-link)
("irc" :follow org-irc-visit :store org-irc-store-link)
               ("info" :follow org-info-open :export org-info-export :store
org-info-store-link)
               ("gnus" :follow org-gnus-open :store org-gnus-store-link)
               ("docview" :follow org-docview-open :export
org-docview-export :store org-docview-store-link)
               ("bibtex" :follow org-bibtex-open :store
org-bibtex-store-link)
               ("bbdb" :follow org-bbdb-open :export org-bbdb-export
:complete org-bbdb-complete-link :store org-bbdb-store-link)
               ("w3m" :store org-w3m-store-link) ("file+sys")
("file+emacs") ("doi" :follow org--open-doi-link)
               ("elisp" :follow org--open-elisp-link) ("file" :complete
org-file-complete-link)
               ("ftp" :follow (lambda (path) (browse-url (concat "ftp:"
path)))) ("help" :follow org--open-help-link)
               ("http" :follow (lambda (path) (browse-url (concat "http:"
path))))
               ("https" :follow (lambda (path) (browse-url (concat "https:"
path))))
               ("mailto" :follow (lambda (path) (browse-url (concat "mailto:"
path))))
               ("message" :follow (lambda (path) (browse-url (concat
"message:" path))))
               ("news" :follow (lambda (path) (browse-url (concat "news:"
path)))) ("shell" :follow org--open-shell-link))
 org-time-clocksum-use-effort-durations t
 )


Thanks and Regards,
Aritra Bhattacharjee