If you check the F1 information window, you will find "Make sure the first few scene props placed are not scripted (start with pw): instance id 0 can't be handled by some scripts." Your scene may work perfectly, or else one scripted scene prop may not work, since an id of 0 represents "no value" in various scripts, for various complicated reasons. To fix it, generally: if you haven't placed many "pw_" scene props yet, just delete all of them, place a few static (native) ones, then replace the pw_ ones you removed; but since I have the list of ids with the module system, I can tell you that scene prop kind 1505 is pw_buy_courser (in PW_4_alpha5), so you could try just replacing all of that kind.