I had similar problems with FL Studio, mostly non-working transport-buttons and faders. But, I found a solution.
For DAW-mode on the KeyLab, make sure you have Standard MCU selected.
In FL Studio, the Midi-settings should look like in the attached pic.Basically, choose "Mackie Control Universal" as input controller type for MIDIIN2 , the Output type for MIDIOUT2 will automatically select the same.
The important part is to have the same port on MIDIOUT2 and MIDIIN2, as shown in the pic. It doesn't have to be 10,
as in my case. But I like to have the lower ports available for other gear.This will make all transportation buttons available, and the sliders and knobs will show values in the LCD
See if these settings improve your situation.