In case anybody encounters rhe same issue as me (i spent hours on it) I thought I would post this.
Trying to solve the multiple tabs session issue using this post;
APEX session isolation across multiple browser tabs - Problem Solved (in APEX 5.1) (0 Bytes)I originally had this
apex_util.prepare_url('f?p=&APP_ID.:20:&APP_SESSION.::NO
and changed it to this
apex_util.prepare_url('f?p=&APP_ID.:20:&APP_SESSION.:APEX_CLONE_SESSION:NO
I then got a checksum error. When I turned off Edit Application properties->Firendly URLs
It worked like a charm. Hope this helps someone.
Apex version 20.2