Ok, i got it again. Now i was talking with my friend in msn, and when i returned to construct and tried to run the app. i got "and invalid texture was referenced. this is a bug, please report it" then i got some other message that i accidentaly clicked away (it was a large one i remember) then i closed the app and tried to open it again i got the mysterious "Error with loading: expecting class (CObj), but recieved (bj"
Note that the program did not crash. it just couldn't run the app, so i closed it myself.
Edit: wait, her's the other message:
Microsoft Visual C++ Runtime Library
Program: *lots of folders*\Application Data\Scirra\Temp.exe
abormal program termination