A319 FLC ATTEMPT FMS STAR REENTRY AS FMS MALFUNCTIONS ON THE KORRY STAR.

Narrative

OPERATING ACR; FLT XXXX MCO-LGA; CLRED TO DSND VIA THE KORRY ONE INTO LGA. ALT XING RESTRS OF 10000 FT AT KORRY AND 11000 FT AT BRAND. APCHING BRAND INTXN; I CHANGED THE RWY OF ARR IN THE FMGC; A NORMAL PROC. WHEN I CHANGED THE RWY; THE ARR ALSO CHANGED; NOT A NORMAL PROC. THE AUTOPLT SWITCHED INTO HEADING AND VERT SPD MODES INSTEAD OF NAV TRACKING AND THE NAV DISPLAY SHOWED THE ARR WE WERE FLYING DISAPPEARED AND THE OTHER ARR WELL OFF TO THE W! THIS HAD NEVER HAPPENED TO ME BEFORE IN 3 YRS ON THE AIRBUS. WHILE WE WERE GETTING THE PROPER ARR RELOADED INTO THE FMGC; WE CROSSED BRAND INTXN IN THE VICINITY OF 11900 FT INSTEAD OF 11000 FT. NO QUERY FROM ATC. WE GOT THE FMGC REPROGRAMMED; AND REALIZED WE WOULD BE TOO HIGH TO MAKE KORRY AT 10000 FT. AS WE PICKED UP THE MIKE TO ADVISE ATC; ATC ASKED IF WE COULD MAKE KORRY AT 10000 FT. WE ADVISED THEM OF OUR NAV PROB AND RECEIVED AMENDED CLRNC TO DSND TO 10000 FT. NO MENTION MADE OF BRAND AT 11000 FT AND NO CONFLICTS. THIS IS A NEW ARR INTO LGA; DESIGNED TO HELP SEPARATE LGA AND EWR ARRS. THE LAST 2 ALT RESTRS ARE ONLY 5 MI APART; AND ARE VERY DIFFICULT TO MAKE AT HIGH SPDS. THE ARR HAS NO SPD RESTRS; SO WE SLOW OURSELVES TO MAKE THE ALTS. THE PROB COMES IN WHEN YOU ARE ASSIGNED A SPD; SUCH AS 290 KTS AS WE WERE. THIS IS THE SECOND TIME I HAVE FLOWN THIS APCH; AND I THINK IT NEEDS SOME WORK! I AM PROBABLY NOT THE ONLY ONE! BUT I SUPPOSE THAT WITH ALL NEW PROCS; IT WILL TAKE SOME GETTING USED TO OR SOME TWEAKING BY ATC TO MAKE IT WORK. AS FOR THE ARR DROPPING OUT OF OUR NAV SYS WHEN THE RWY WAS CHANGED; THAT WAS THE FIRST TIME I HAVE SEEN THAT HAPPEN; AND I COULD NOT DUPLICATE IT AGAIN. A GLITCH? LET'S HOPE SO. IF A SOFTWARE PROB? LET'S GET IT FIXED. THIS WAS ANOTHER 'WHAT'S IT DOING THAT FOR?!