1.
a. you can try closing debuggers first>> open browser>>clear cache> close browser again>>open fiddler>> delete unnecessary swf's(those you didn't need)>> click clear cache on fiddler>> drag and drop only the files you want to use>>click clear cache again on fiddler>>open browser then play..
if this does not work
1.
b. your internet latency is too high or speed is too low..
2. maybe your finishing your missions too fast, try after finishing a mission wait 20-30seconds before entering a new mission.. or it has been patched, you'll need new files
3. those missions can only be done 2x per char. more than that error
4. when you login your character you'll get an
Error 1100 from shin.. and as of now I have no idea how to recover banned characters..
hope it helps