diff --git a/dropbox/dropbox.go b/dropbox/dropbox.go
index 7a94b2b4f..57ec49aa5 100644
--- a/dropbox/dropbox.go
+++ b/dropbox/dropbox.go
@@ -71,7 +71,10 @@ func configHelper(name string) {
 	}
 
 	// Get a dropbox
-	db := newDropbox(name)
+	db, err := newDropbox(name)
+	if err != nil {
+		log.Fatalf("Failed to create dropbox client: %v", err)
+	}
 
 	// This method will ask the user to visit an URL and paste the generated code.
 	if err := db.Auth(); err != nil {
@@ -125,7 +128,7 @@ func (f *FsDropbox) String() string {
 }
 
 // Makes a new dropbox from the config
-func newDropbox(name string) *dropbox.Dropbox {
+func newDropbox(name string) (*dropbox.Dropbox, error) {
 	db := dropbox.NewDropbox()
 
 	appKey := fs.ConfigFile.MustValue(name, "app_key")
@@ -137,9 +140,8 @@ func newDropbox(name string) *dropbox.Dropbox {
 		appSecret = fs.Reveal(rcloneAppSecret)
 	}
 
-	db.SetAppInfo(appKey, appSecret)
-
-	return db
+	err := db.SetAppInfo(appKey, appSecret)
+	return db, err
 }
 
 // NewFs contstructs an FsDropbox from the path, container:path
@@ -147,7 +149,10 @@ func NewFs(name, root string) (fs.Fs, error) {
 	if uploadChunkSize > maxUploadChunkSize {
 		return nil, fmt.Errorf("Chunk size too big, must be < %v", maxUploadChunkSize)
 	}
-	db := newDropbox(name)
+	db, err := newDropbox(name)
+	if err != nil {
+		return nil, err
+	}
 	f := &FsDropbox{
 		name: name,
 		db:   db,
diff --git a/dropbox/nametree.go b/dropbox/nametree.go
index da68ca691..5630cf388 100644
--- a/dropbox/nametree.go
+++ b/dropbox/nametree.go
@@ -3,9 +3,10 @@ package dropbox
 import (
 	"bytes"
 	"fmt"
+	"strings"
+
 	"github.com/ncw/rclone/fs"
 	"github.com/stacktic/dropbox"
-	"strings"
 )
 
 type NameTreeNode struct {
@@ -135,8 +136,8 @@ func (tree *NameTreeNode) GetPathWithCorrectCase(path string) *string {
 			return nil
 		}
 
-		result.WriteString("/")
-		result.WriteString(current.CaseCorrectName)
+		_, _ = result.WriteString("/")
+		_, _ = result.WriteString(current.CaseCorrectName)
 	}
 
 	resultString := result.String()
diff --git a/fs/operations.go b/fs/operations.go
index d8b5d7945..20a93b2bc 100644
--- a/fs/operations.go
+++ b/fs/operations.go
@@ -326,11 +326,16 @@ func PairMover(in ObjectPairChan, fdst Fs, wg *sync.WaitGroup) {
 				err := dst.Remove()
 				if err != nil {
 					Stats.Error()
-					ErrorLog(dst, "Couldn't delete: %s", err)
+					ErrorLog(dst, "Couldn't delete: %v", err)
 				}
 			}
-			fdstMover.Move(src, src.Remote())
-			Debug(src, "Moved")
+			_, err := fdstMover.Move(src, src.Remote())
+			if err != nil {
+				Stats.Error()
+				ErrorLog(dst, "Couldn't move: %v", err)
+			} else {
+				Debug(src, "Moved")
+			}
 		} else {
 			Copy(fdst, pair.dst, src)
 		}
@@ -615,10 +620,12 @@ func ListFn(f Fs, fn func(Object)) error {
 var outMutex sync.Mutex
 
 // Synchronized fmt.Fprintf
-func syncFprintf(w io.Writer, format string, a ...interface{}) (n int, err error) {
+//
+// Ignores errors from Fprintf
+func syncFprintf(w io.Writer, format string, a ...interface{}) {
 	outMutex.Lock()
 	defer outMutex.Unlock()
-	return fmt.Fprintf(w, format, a...)
+	_, _ = fmt.Fprintf(w, format, a...)
 }
 
 // List the Fs to the supplied writer
diff --git a/oauthutil/oauthutil.go b/oauthutil/oauthutil.go
index 21b23ff29..80c27ccab 100644
--- a/oauthutil/oauthutil.go
+++ b/oauthutil/oauthutil.go
@@ -121,7 +121,10 @@ func (ts *tokenSource) Token() (*oauth2.Token, error) {
 		return nil, err
 	}
 	if *token != ts.OldToken {
-		putToken(ts.Name, token)
+		err = putToken(ts.Name, token)
+		if err != nil {
+			return nil, err
+		}
 	}
 	return token, nil
 }
@@ -303,8 +306,8 @@ func (s *authServer) Start() {
 	if err != nil {
 		log.Fatalf("Failed to start auth webserver: %v", err)
 	}
-	server.Serve(s.listener)
-	fs.Debug(nil, "Closed auth server")
+	err = server.Serve(s.listener)
+	fs.Debug(nil, "Closed auth server with error: %v", err)
 }
 
 func (s *authServer) Stop() {
diff --git a/pacer/pacer_test.go b/pacer/pacer_test.go
index e0c1c5728..bd399d954 100644
--- a/pacer/pacer_test.go
+++ b/pacer/pacer_test.go
@@ -205,7 +205,7 @@ func TestAmazonCloudDrivePacer(t *testing.T) {
 		got := sum / n
 		//t.Logf("%+v: got = %v", test, got)
 		if got < (test.want*9)/10 || got > (test.want*11)/10 {
-			t.Fatalf("%+v: bad sleep want %v+/-10% got %v", test, test.want, got)
+			t.Fatalf("%+v: bad sleep want %v+/-10%% got %v", test, test.want, got)
 		}
 	}
 }
diff --git a/rclone.go b/rclone.go
index 36a3f4118..adc6444d8 100644
--- a/rclone.go
+++ b/rclone.go
@@ -356,7 +356,10 @@ func main() {
 		if err != nil {
 			log.Fatalf("Failed to open log file: %v", err)
 		}
-		f.Seek(0, os.SEEK_END)
+		_, err = f.Seek(0, os.SEEK_END)
+		if err != nil {
+			log.Printf("Failed to seek log file to end: %v", err)
+		}
 		log.SetOutput(f)
 		redirectStderr(f)
 	}
diff --git a/s3/v2sign.go b/s3/v2sign.go
index 834e0ba5e..8398741e9 100644
--- a/s3/v2sign.go
+++ b/s3/v2sign.go
@@ -106,7 +106,7 @@ func sign(AccessKey, SecretKey string, req *http.Request) {
 	// Make signature
 	payload := req.Method + "\n" + md5 + "\n" + contentType + "\n" + date + "\n" + joinedHeadersToSign + uri
 	hash := hmac.New(sha1.New, []byte(SecretKey))
-	hash.Write([]byte(payload))
+	_, _ = hash.Write([]byte(payload))
 	signature := make([]byte, base64.StdEncoding.EncodedLen(hash.Size()))
 	base64.StdEncoding.Encode(signature, hash.Sum(nil))