Conflict with NextGen Gallery plugin

I use ImageMapper as well as NextGen Gallery, and when ImageMapper is active one of NextGen’s Menu Pages, “Other Options” is not visible, and only Administrator level Users can see the NextGen Item in their side Menu or when composing pages. Editor level Users and lower see no menu items for NextGen. If I deactivate ImageMapper then NextGen works perfectly.
I have reported this to Photcrati NextGen ( https://wordpress.org/support/users/photocrati/ )who have asked me to report it to you so that you may review and update your code as needed. They say that, “Given its age there may be things in a potentially planned refactor that would resolve these issues”.
You can see the dialogue of my report to them on this link
https://wordpress.org/support/topic/gallery-other-options-menu-not-available/#post-9149888
As ImageMapper is an essential part of my website I must retain it, but it does make use of NextGen difficult because Editor level Users cannot in practice use NextGen.
Many Thanks