Attacking Libraries

Hello to everybody, i'm new here and i'm working with arduino since january 2012.

My Problem ist the following: I wan't to use the build in UART of the atmega328 for DMX sending and receiving with this library: A Arduino Library for sending and receiving DMX
To get DMX Data, I communicate with another microcontroller over a SoftwareSerial Port (included library in arduino IDE). Now everything works fine, if I only dimm LED's on PWM output pins, by the serial data.
But when I include the DMX library, nothing happens.
No responing data come out of the SoftwareSerial port, and no data come out of the UART.

So is it possible, that the two libraries want to use the same ressources (Timers, RAM, ...) ?
I'm not really good in programming C, so it would be really nice, if someone take a look to the two libraries an might say me, where the problem is, or if there is another libraray i can use for software-serial or dmx sending an receiving (of course not at the same time receiving and sending)

LG
newcommer95