Index: command.c
===================================================================
--- command.c	(revision 7633)
+++ command.c	(working copy)
@@ -314,7 +314,7 @@
 /* This function range-checks a cmd, and checks if the cmd is not NULL */
 bool IsValidCommand(uint cmd)
 {
-	cmd &= 0xFF;
+	cmd &= CMD_MASK;
 
 	return
 		cmd < lengthof(_command_proc_table) &&
@@ -323,7 +323,7 @@
 
 byte GetCommandFlags(uint cmd)
 {
-	return _command_proc_table[cmd & 0xFF].flags;
+	return _command_proc_table[cmd & CMD_MASK].flags;
 }
 
 
@@ -437,8 +437,8 @@
 	if (cmd & CMD_NO_WATER) flags |= DC_NO_WATER;
 
 	// get pointer to command handler
-	assert((cmd & 0xFF) < lengthof(_command_proc_table));
-	proc = _command_proc_table[cmd & 0xFF].proc;
+	assert((cmd & CMD_MASK) < lengthof(_command_proc_table));
+	proc = _command_proc_table[cmd & CMD_MASK].proc;
 	if (proc == NULL) {
 		_cmd_text = NULL;
 		return false;
@@ -454,16 +454,16 @@
 	// disconnect the road system), but the exec will succeed and this
 	// fact will trigger an assertion failure. --pasky
 	notest =
-		(cmd & 0xFF) == CMD_CLEAR_AREA ||
-		(cmd & 0xFF) == CMD_CONVERT_RAIL ||
-		(cmd & 0xFF) == CMD_LEVEL_LAND ||
-		(cmd & 0xFF) == CMD_REMOVE_ROAD ||
-		(cmd & 0xFF) == CMD_REMOVE_LONG_ROAD;
+		(cmd & CMD_MASK) == CMD_CLEAR_AREA ||
+		(cmd & CMD_MASK) == CMD_CONVERT_RAIL ||
+		(cmd & CMD_MASK) == CMD_LEVEL_LAND ||
+		(cmd & CMD_MASK) == CMD_REMOVE_ROAD ||
+		(cmd & CMD_MASK) == CMD_REMOVE_LONG_ROAD;
 
 	_docommand_recursive = 1;
 
 	// cost estimation only?
-	if (!IsGeneratingWorld() && _shift_pressed && IsLocalPlayer() && !(cmd & (CMD_NETWORK_COMMAND | CMD_SHOW_NO_ERROR))) {
+	if (!IsGeneratingWorld() && _shift_pressed && IsLocalPlayer() && !(cmd & (CMD_NETWORK_COMMAND | CMD_SHOW_NO_ERROR)) && ((cmd & CMD_MASK) != CMD_PAUSE)) {
 		// estimate the cost.
 		res = proc(tile, flags, p1, p2);
 		if (CmdFailed(res)) {
Index: command.h
===================================================================
--- command.h	(revision 7633)
+++ command.h	(working copy)
@@ -142,7 +142,12 @@
 	CMD_DEPOT_MASS_AUTOREPLACE       = 119,
 };
 
+/* Specifies which bits are used in the actual command specification (as opposed to any optional flags) such as CMD_NETWORK_COMMAND */
 enum {
+	CMD_MASK = 0xFF
+};
+
+enum {
 	DC_EXEC            = 0x01,
 	DC_AUTO            = 0x02, // don't allow building on structures
 	DC_QUERY_COST      = 0x04, // query cost only,  don't build.