Yes, I did just that, i.e. removed the db and incremental_db and start from the beginning. I also re-generated the Qsys with 11.1 I still get this message:
Error (15096): Can't implement PLL "rootport_fifo_qsys:u0|rootport_fifo_qsys_qsys_pll:qsys_pll|rootport_fifo_qsys_qsys_pll_altpll_5rs2:sd1|pll7"
Error: Quartus II 64-Bit Fitter was unsuccessful. 1 error, 0 warnings
Error: Peak virtual memory: 470 megabytes
Error: Processing ended: Wed Oct 03 11:03:47 2012
Error: Elapsed time: 00:00:03
Error: Total CPU time (on all processors): 00:00:03
I fails right away the fitter after passing the synth ok.
Thanks,
Shvitzer