You can reproduce this by placing a .zip file in a directory with many files, viewing as detailed list and making the .zip file place near the bottom of the window so that context menu opens "above" the cursor. Exit the directory, reenter it, and right-click [do not hold] a .zip file near the bottom of the window. This makes thunar execute "Extract to.." and archive manager opens. If a file higher in the list is right clicked after entering new directory no problem occurs.
*** With "above" I meant that the context menu's left bottom corner is on the cursor.
Cannot reproduce that with v1.6.3 ... it it still an issue for you with the current version? - How many files do you have in the folder ? I filled it with ~30 copies of the same zip-file - Does the bug appear for any kind of .zip archive ?
Args, just noticed that it is filed against 1.6.10 ... I'll take a try on newer version later
Ok, I think I know what happens. - right -click on a file and hold the mousekey down (can be some text-file, does not matter) - while clicking move the mouse on the right-click menu - release the mouse on an item in the right-click menu --> the item will be "clicked" If you move your mouse fast while right clicking on the zip-file, the described behavior may happen. If you dont move the mouse while clicking, nothing happens. I dont think this is a bug, it looks intentional. Actually I would not want to remove it, since there may be users using it.
while clicking --> while holding the key down
Yes, I could kinda reproduce this just a couple of times in a lot of attempts, in my case it opens Properties not Extract to, but it felt like I accidentally hold the right button a little longer than I should. As a matter of fact, it's "solved" in GTK3, the context menu is not placed too near the cursor to be mistakenly clicked.