Hmm... That's interesting. I just ran the example on my board and it behaves exactly as expected. Two things I'll note are:
1) The example says that DAC0 is J2. This is incorrect. J2 is DTOUT0, the timer output. DAC0 is J2.
2) You should also connect VSSA_DAC_ADC to ground; J2 to J2. This is the ground reference pin for the analog module.
Do either of these help?
i will help i hope. it actually made my work about to be completed and hopefully if there is still an issue what you shared is something that i have to apply. i will post mine once completed and hopefully someone will help me:)