Title says it all

does it give a error message?

No

EDIT: It says that I have too many master files( I also have Honest Hearts ), but it won't let me load my mod without Honest Hearts even theough I used absolutly nothing from it

hhmmmm well all i can suggest is just try making sure geck is upto date (1.4 i think) and maybe restarting your computer (if you just installed it) and maybe reinstalling the game ya know just general trouble shooting

do you tick both the fallout NV esm and the oldworld blues ESM?

EDIT search geck.ini in your start bar then open GECKCustom.ini in notepad look for "bAllowMultipleMasterLoads=0" and change the 0 to 1

Yes I do, Also it worked fine yesterday

Note: I bought Old World Blues yesterday, do I need to update the geck because of it?

should just update geck regardless but read the edit on my last post will solve your problem =]

Edit: if you have geck for FONV and FO:3 you will see two of them but if your unsure which is which just change both hehe

It's working now

Thank You good Sir!