World Editor stops responding upon saving

[SpasMaster]

As the title says: As of today, my World Editor began to stop responding when trying to save my map. The issue is most likely a map issue, since the problem occurs only with 1 specific map and not with others.

My question is: in a big map, what could be the possible reasons for causing World Editor to stop responding upon saving the map.
EDIT: Managed to find a clue - I have been using upgrades as of lately and I heard they could be an issue. But how?

 

[Legal_Ease]

As the title says: As of today, my World Editor began to stop responding when trying to save my map. The issue is most likely a map issue, since the problem occurs only with 1 specific map and not with others.

My question is: in a big map, what could be the possible reasons for causing World Editor to stop responding upon saving the map.
EDIT: Managed to find a clue - I have been using upgrades as of lately and I heard they could be an issue. But how?

Does it say "referencing unknown ability" or something like that along the bottom of the main editor page after you try to save? Upgrades are fine, but its the same as other things in OE, if they reference objects that do not exist (spells,units,buffs,items, etc.) that could be your problem.

 

[KILLCIDE]

Only way to really find out is process of elimination. It would be more helpful if you posted your map so I can take a better look at it.