Descriptive Problem Summary: While using Find/Replace in the map editor to replace obj/mobs with other instances of that objs/mobs, it fails to replace them.

Numbered Steps to Reproduce Problem:
1) Download the following test project: http://files.byondhome.com/Higoten/Tests/ Obj%20Find%20and%20Replace%20Failure.zip
2) Navigate to map.dmm and navigate to the Objs tab.
3) Use Find Object on Map... on the 1 obj. Copy the instance reference (9), and close the dialogue.
4) Use Find Object on Map... on the 2 obj. Paste the instance reference from step 3 into the Replace With box. Press Replace All.
5) Observe on the map that the 2 objs have not been replaced with the 1 objs. Further inspection with the right-hand instance editor confirms that no change has been made.

Expected Results: Following the instructions above, for the 2 objs to be replaced with the 1 objs.

Actual Results: No replacements are made. The output box reports that replacements are made.

Does the problem occur:
Every time? Or how often? Every time.
In other games? Untested.
In other user accounts? Untested.
On other computers? Untested.

When does the problem NOT occur? This does not occur with turfs.