No Problemo
There's a file you can delete instead of having to start UT. I believe it's called running.ini, (whatever the name, it's detailed in the manual) I created a batch file to blow it away, but it's on my home PC, It's a simple file and runs quickly, I'll post the text of the file this afternoon when I get home. You will have to customize it for your install location.
HERE IT IS:
REM This batch file should delete the running.ini to quickly get Infiltration up and running again.
@echo off
CD\
REM change this next line to point to your Unreal tournament system directory
REM Remember Batch files are 8.3 so if your using long file names find the proper
REM truncated filename(notice the unreal~1 below)
CD c:\unreal~1\system
del running.ini
exit