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Looks like there are several people experiencing the same problem here
It saves but does not display the updated ad.
When creating a new one, it either saves (but not really) or it throws an error.
Same happens when you click the ad name or click edit.
Sometimes what also happens is when u save an ad come back it looks like it saved and then when u go back again it still the old code.
Also happens when u try to create a new ad.
Latest release of plugin (3.4.19) and WP 3.1.2