Hey, I've been using the editor fine for the past week. I've made some small basic maps. Then today I try to boot the editor and the green unreal image pops up and all but then it says "UT3.exe has encountered a problem and needs to close..." Any ideas/solutions with this problem? Thanks 
(I would of posted my specs but I doubt my rig is the problem)
This was part of the error report.
Assertion failed: BulkDataOffsetInFile == Ar.Tell() [File:.\Src\UnBulkData.cpp] [Line: 610]
Stack:
RaiseException() Address = 0x7c812aeb (filename not found)
CxxThrowException() Address = 0x78158e89 (filename not found)
Address = 0xb9f7e2 (filename not found)
Address = 0xe8781b4c (filename not found)
(I would of posted my specs but I doubt my rig is the problem) This was part of the error report.
Assertion failed: BulkDataOffsetInFile == Ar.Tell() [File:.\Src\UnBulkData.cpp] [Line: 610]
Stack:
RaiseException() Address = 0x7c812aeb (filename not found)
CxxThrowException() Address = 0x78158e89 (filename not found)
Address = 0xb9f7e2 (filename not found)
Address = 0xe8781b4c (filename not found)