what do you mean, "one track"
do you mean that whatever you put in Track number 3 (for example), and then save it, doesn't get a pk saved with it?
and two more things, one is, the session may take forever to open just becuase it is very complicated and large. I use CEP for full band recordings regularly (i have started a recording studio) and i am currently working on a ska band. several of those sessions have 50 or so tracks in them right now (usually all playing simultaneously too), we have 8 drums, 8 trombone (four mics, doubled for true stereo), and many, many takes, true stereo doubles, and different parts of guitar, all on four mics each so we have options later (not to use all four in the end, mind you-that means trouble). these sessions (which don't even have bass or vocals yet), and others like it take as long as ten minutes to load on my 3 GHz pentium 4 pavilion
lastly, i have seen, to date (in almost two years of experience with the program) no purpose for the pk files. If you have found what purpose they serve, let me know, i am very curious, i have deleted them and seen no change.
hope this helps, my email is
keith@blackoutstudioproductions.com