ApeksOPS has built-in protection against data update conflicts in a multi-user environment.  This sometimes means that a user won’t be able to save changes if something they changed was also changed by someone else.  To lower the likelihood of this happening (at the expense of slightly reduced performance), go to ApeksOPS > Settings and set “High Concurrency” to “Yes”.

If you’ll be using ApeksOPS as a single user, you can improve performance by going to ApeksOPS > Settings and setting “Optimistic Locking” to “Yes” (leave “High Concurrency” as “No”).