Ulimit command cannot be use as before in Mavericks

I updated the OS X to Yosemite, and some programs (IBM DB2) do not work because of the open files limit.
When I opened terminal the first time after the update, it appeared:
    -bash: ulimit: open files: cannot modify limit: Invalid argument
The open file limit was established to 65000, but now it does not support that value.
When I executed ulimit -n, I played with different values, and I couldn't set a value greater than 12288.
It is weird this behaviour and I do not know what blocks the fact to set an greater value as 65000.
    Andress-MBP:~ root# ulimit -n 10001
    -sh: ulimit: open files: cannot modify limit: Invalid argument
    Andress-MBP:~ root# ulimit -n 10000

as said above
PlotinusVeritasNov 30, 2013 10:17 AMin response to rafadore
usually in such instances resetting mission control gestures in Sys. preferences resolves it
uncheck and recheck your trackpad gestures and re-verify.
then restart mac, this fixed my error....hope it works

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