Is my DSP overloading?

  • Hey there fellows

    I have recently been experiencing a slow response ( or no response) to midi info to the Ti Desktop from my MPC 1000... this is the first time this has happened in 3 years .. i always run in Multi mode as they are song arrangements dedicated to each track. I have a Nord & moog also in the MPC both programming & receiving Midi data correctly so i can only thing the TI is having issues..
    On the Screen the Little rectangle between Midi part & preset name is seeing to be full of blocks.?
    I have tried to find what this means in the manual but cannot see??
    I can only imagine its DSP.. am i right?
    if so what is using more now than before? i seem to only use up to 4 or 5 of the Midi channels in each Multi set & an only using the first 16 due to the inability to save any preset changes...
    love to hear what you might think is happenin..