Soundchoice Mutisession Won't Read - Older Plextor FIRMWARE at fault

[KJAT9]

I have imported aprx. 1000 of my CDG's of various mfgrs into hoster including some soundchoice multisession cdg's, but as I got down to the last 50 soundchoice cdg's I can't read these with hoster at all. I have gone back and tried ealier imported soundchoice multisession cdg's, and these still read just fine. the SC cdg's that won't read are my most recent purchased ones, mainly
SC3314 through 3400, and several earlier 2200 series.
I have a recently MTU factory configured portable Hoster pc w/ P4 @3 ghz,
200ghd, plextor px-716, 7 hoster upgraded to 3.4.
It seems that w/ my ealier hoster 2.**, multissesions would read all but the last track. but now w/ hooster 3.** I can't get them to read at all.
Does anyone have a solution?