In which version of eZ are you experiencing this problem? I just tried the latest community release (2011-7) and was able to switch between full edit-screen without loosing the anchors.
Regards Robin
Board member, eZ Publish Community Project Board - Member of the share.ez.no team - Key values: Openness and Innovation.
is it possible for you to test 4.5 on a localhost? See if the problem is solved in that release?
If that is the case, there are two obvious options which are to either upgrade to 4.5 or look for the patch/fix that solved the problem and apply it on your 4.3 install.
Regards Robin
Board member, eZ Publish Community Project Board - Member of the share.ez.no team - Key values: Openness and Innovation.