I ran into the following stacktrace when running ancient sun of fire in r7161. So there seems to be a bug, but the one I fixed is gone. Tibor, any ideas? 0 widelands 0x000000010221fb3d DefaultAI::check_productionsites(int) + 6973 (string:1714) 1 widelands 0x0000000102214689 DefaultAI::think() + 377 (defaultai.cc:198) 2 widelands 0x0000000101cd93d3 NetHost::think() + 643 (nethost.cc:978) 3 widelands 0x0000000101a960d0 Widelands::Game::think() + 112 (game.cc:612) 4 widelands 0x0000000101f5e911 Interactive_Base::think() + 673 (interactive_base.cc:385) 5 widelands 0x0000000101d8c893 UI::Panel::do_think() + 51 (panel.cc:590) 6 widelands 0x0000000101d8c3dc UI::Panel::run() + 892 (panel.cc:213) 7 widelands 0x0000000101a92823 Widelands::Game::run(UI::ProgressWindow*, Widelands::Game::Start_Game_Type, std::__1::basic_string, std::__1::allocator > const&, bool) + 5219 (game.cc:571) 8 widelands 0x0000000101cd5781 NetHost::run(bool) + 12833 (nethost.cc:905) 9 widelands 0x00000001018e6570 WLApplication::mainmenu_multiplayer() + 1824 (wlapplication.cc:1458) 10 widelands 0x00000001018dd483 WLApplication::mainmenu() + 3283 (wlapplication.cc:1307) 11 widelands 0x00000001018db1a8 WLApplication::run() + 9480 (wlapplication.cc:478) 12 widelands 0x00000001018c9b26 SDL_main + 1798 (main.cc:104) 13 widelands 0x00000001018cc9c9 -[SDLMain applicationDidFinishLaunching:] + 49 14 com.apple.CoreFoundation 0x00007fff8e706e0c __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ + 12 15 com.apple.CoreFoundation 0x00007fff8e5fa82d _CFXNotificationPost + 2893 16 com.apple.Foundation 0x00007fff8f82f7ba -[NSNotificationCenter postNotificationName:object:userInfo:] + 68 17 com.apple.AppKit 0x00007fff911c5b69 -[NSApplication _postDidFinishNotification] + 289 18 com.apple.AppKit 0x00007fff911c589c -[NSApplication _sendFinishLaunchingNotification] + 195 19 com.apple.AppKit 0x00007fff911c2786 -[NSApplication(NSAppleEventHandling) _handleAEOpenEvent:] + 570 20 com.apple.AppKit 0x00007fff911c21db -[NSApplication(NSAppleEventHandling) _handleCoreEvent:withReplyEvent:] + 242 21 com.apple.Foundation 0x00007fff8f84df0a -[NSAppleEventManager dispatchRawAppleEvent:withRawReply:handlerRefCon:] + 294 22 com.apple.Foundation 0x00007fff8f84dd7d _NSAppleEventManagerGenericHandler + 106 23 com.apple.AE 0x00007fff8cc86e1f aeDispatchAppleEvent(AEDesc const*, AEDesc*, unsigned int, unsigned char*) + 381 24 com.apple.AE 0x00007fff8cc86c32 dispatchEventAndSendReply(AEDesc const*, AEDesc*) + 31 25 com.apple.AE 0x00007fff8cc86b36 aeProcessAppleEvent + 315 26 com.apple.HIToolbox 0x00007fff8ac75161 AEProcessAppleEvent + 56 27 com.apple.AppKit 0x00007fff911be0b6 _DPSNextEvent + 1026 28 com.apple.AppKit 0x00007fff911bd89b -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 122 29 com.apple.AppKit 0x00007fff911b199c -[NSApplication run] + 553 30 widelands 0x00000001018ccfed main + 1305 31 libdyld.dylib 0x00007fff920cf5fd start + 1