roundcube 0.7.3 js error:rcmail undefined in ie8

[mihaisheng]

roundcube 0.7.2 is ok in ie8.

roundcube 0.7.3 have a  js error  "rcmail undefined" in ie8

so,every mail box show nothing.

[SKaero]

Are you using any plugins? Have you tried clearing your cache?

[mihaisheng]

no plugin. 
i try to clear cache.
the problem still alive.

[SKaero]

rcmail is a main object so I don't see how it could be working on one browser but not the other. Are you using a custom skin?

[mihaisheng]

the skin is default.

i will email the test websit to you.

thanks very much.

[SKaero]

Ok after testing it I see the problem, there is a folder (not sure of the name it just shows up as question marks for me) that was set as the sent folder. That was causing RoundCube to send "null:{"subject":1,"to":1}" as part of the environment variables which a proper browser ignores but causes IE to stop loading any JS causing the rest of the errors. I have the Chinese character set for so I don't think that is the problem, I'm going to guess it is corrupted a folder since it wont open. Its in the folder list, let me know if you can give me anymore information on what that folder is.