SSIS, I love you but I hate you so much

It got me again, during development I used a mapped drive throughout my project and everything works perfectly. To see those green boxes fill your screen relaxes you like nothing else. I mean, not really but it feels good like nothing else. Ok, not true, but back to the point...
Deployed the package, run it through a SQL Agent job and kaboooom. Error. Spit out the gum, straighten the back, pull the chair into the desk a little more...
After hours of agony I remembered that you should never use mapped drives with SSIS/SQL jobs, and pretty much anything else.
After using UNC paths to network shares everything is back to green.

Take away: D O    N O T    U S E    M A P P E D    D R I V E S    I N    S S I S. They don't mix well, just like oil and water...