--- capa/capa51/GUITools/capastats.tcl	2000/01/12 21:00:24	1.10
+++ capa/capa51/GUITools/capastats.tcl	2000/01/31 18:34:13	1.11
@@ -1099,13 +1099,14 @@ proc CTcollectSetScores { num path id on
 			    set char [lindex $ans_char $i]
 			    if { $char == "N" || $char == "n"} { set found 1 }
 			    if { $char == "Y" || $char == "y"} { 
-				incr score [lindex $weights $i];set found 1
+				catch {incr score [lindex $weights $i]}
+				set found 1
 			    }
 			    if { $char >= 0 && $char <= 9 } { 
 				incr score $char;set found 1
 			    }
 			    if { $char == "E" } {
-				incr valid_weights "-[lindex $weights $i]"
+				catch {incr valid_weights "-[lindex $weights $i]"}
 			    }
 			}
 			incr total_scores $score
@@ -1572,14 +1573,14 @@ proc CTitemCorrelation { num classpath s
 			## $ans_char($ii) is one of 0 .. 9, Y, y, N, n
 			## $ans_char($jj) is one of 0 .. 9, Y, y, N, n
 			if { $ans_char($ii) == "Y" || $ans_char($ii) == "y" } {
-			    set x_data [lindex $weights $ii]
+			    if {[set x_data [lindex $weights $ii]]==""} {set x_data 0}
 			} elseif { $ans_char($ii) == "N" || $ans_char($ii) == "n" } {
 			    set x_data 0
 			} else { ## must be in 0 .. 9
 			    set x_data $ans_char($ii)
 			}
 			if { $ans_char($jj) == "Y" || $ans_char($jj) == "y" } {
-			    set y_data [lindex $weights $jj]
+			    if {[set y_data [lindex $weights $jj]]==""} {set y_data 0}
 			} elseif { $ans_char($jj) == "N" || $ans_char($jj) == "n" } {
 			    set y_data 0
 			} else { ## must be in 0 .. 9
@@ -2537,8 +2538,10 @@ proc CTdisplayStudent { num window path
 
     label $infoFrame.label -text $id
     pack $infoFrame.label
-
-    set canvas [canvas $imageFrame.canvas]
+    
+    set height [image height $image]
+    set width [image width $image]
+    set canvas [canvas $imageFrame.canvas -height $height -width $width]
     pack $canvas
     $canvas create image 1 1 -image $image -anchor nw
 }
@@ -2683,7 +2686,7 @@ proc CTdiscussForum { num file dir resul
     while {![eof $fileId]} {
 	incr line_cnt
 	if { ($line_cnt%20) == 0 } { updateStatusBar [expr $line_cnt/double($maxLine)] $num }
-	foreach {stunum capaid name email action set prob date time} [split $aline "|"] {}
+	foreach {stunum capaid name email action set prob date time blank} [split $aline "|"] {}
 	if {$specificSet && ($specificSet == $set)} {set aline [gets $fileId];continue}
 	if { $action == "ViewProblem" } {
 	    if { [catch {incr count($set,$prob)}]} {