C152 INSTRUCTOR AND STUDENT WERE ACCUSED OF IGNORING THE ATCT LCL CTLR'S INSTRUCTIONS TO EXECUTE A GAR.

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A STUDENT AND I WERE DOING TKOFS AND LNDGS IN THE PATTERN. ON DOWNWIND; WE WERE TOLD WE WERE #3 TO LAND AND WE RPTED WE HAD TFC IN SIGHT AND FOLLOWED THE #2 ACFT IN AND LANDED. THE #2 ACFT WAS STILL ON THE OPPOSITE END OF THE RWY TAXIING OFF SO WE HELD ON THE APCH END FOR HIM TO CLR THE RWY. THE CTLR THEN ASKED OUR ACFT HOW WE READ HIS XMISSION. IT WAS A LITTLE GARBLED; BUT UNDERSTANDABLE. HE THEN TOLD US HE HAD GIVEN US DIRECTIONS TO GO AROUND TO LET THE OTHER ACFT CLR THE RWY. NEITHER MY STUDENT NOR I HAD HEARD THAT DIRECTIVE. I ASSUME HE WAS EITHER STEPPED ON BY ANOTHER XMISSION (AS THERE WERE MANY ACFT INBOUND AND LNDG); OUR RADIO NEVER PICKED IT UP; OR WE BOTH JUST DID NOT HEAR HIS REQUEST. WHATEVER THE CIRCUMSTANCE; I WOULD HAVE LIKED FOR THE ORDER TO HAVE BEEN REPEATED SINCE WE DID NOT ACKNOWLEDGE THAT WE RECEIVED IT. THIS SIT WILL PROBABLY BE REPEATED DUE TO THE UNUSUAL NEW RULES IMPLEMENTED BY CNW TWR AND THE FACT THAT IT IS A HIGH TFC TRAINING ARPT FOR BOTH GA STUDENTS AND MIL TRAINING. THE PROB IS THAT DUE TO THESE NEW REQUESTS; LNDG ACFT MUST TAXI ABOUT 2/3 OF THE WAY DOWN THE RWY (RWY 35L) BEFORE THERE IS A PLACE TO EXIT CLR OF THE RWY; SO THE #2 ACFT WILL HAVE TO BE TOLD TO GO AROUND WHILE #1 ACFT IS TAXIING DOWN THE LONG RWY. NO TAXI IS PERMITTED S OF THE FENCE LINE DEPICTED WITHOUT A CLRNC TO ENTER THE RWY. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR RPTS THE RWY HOLD LINE; THE ENTIRE LENGTH OF RWY 17R/35L NEXT TO THE RAMP; TO THE W OF THE RWY WAS MOVED FURTHER AWAY. THIS DID NOT LEAVE ENOUGH ROOM TO TAXI OFF THE RWY OR TO TAXI TO THE PAINTED; MARKED TXWY. IN ESSENCE; THE TXWY W OF RWY 17R/35L BECAME UNUSABLE. BECAUSE OF CONTINUING PROBS THE HOLD LINE HAS BEEN RETURNED TO ITS ORIGINAL POSITION AND THE PROB IS NO LONGER PRESENT.