Editor crashes - (Assertion failed)

[Odedge]

I can open any map with out any problems. I can open the lastest build of my map with no problems. But if I open a recent build of my map, then open another recent build of the map, I get the following error message...

Build UT2004_Build_[2005-11-23_16.22]

OS: Windows XP 5.1 (Build: 2600)
CPU: GenuineIntel Unknown processor @ 3003 MHz with 2043MB RAM
Video: NVIDIA GeForce 7800 GTX (9424)

Assertion failed: Obj->GetLinker() [File:.\UnObj.cpp] [Line: 3954]

History: PreLoadObjects <- UObject::EndLoad <- UObject::LoadPackage <- UEditorEngine::Exec_Map <- UEditorEngine::Exec <- (MAP LOAD FILE="C:\Programs\Games\UT2004\Maps\DM-cwv_AAA_SawMill018_1.ut2").. <- UUnrealEdEngine::Exec <- FileOpen <- WEditorFrame::OnCommand <- WWindow::WndProc <- WWindow::StaticProc <- MessagePump <- MainLoop

I am hoping the game just needs to be reinstalled, but I will wait to see if anyone else has any ideas. Thanks in advanced for any help.

[Angel_Mapper]

Sometimes matinee actors and other actors will interfere with each other, if you can open the maps separately then I wouldn't worry about it.

[MindRiot]

Sometimes its helpful to clear the current map by clicking new, then load an older or newer version of that same map.

However, sometimes the editor can crash even when creating a new map.