diff --git a/lib/program.js b/lib/program.js
index 1b7aa72..62b18b9 100644
--- a/lib/program.js
+++ b/lib/program.js
@@ -89,6 +89,8 @@ function Program(options) {
   this.isRxvt = /rxvt/i.test(process.env.COLORTERM);
   this.isXterm = false;
 
+  this.isTMUX = this.term('screen') && !!process.env.TMUX;
+
   this._buf = '';
   this._flush = this.flush.bind(this);
 
@@ -3159,6 +3161,16 @@ Program.prototype.enableMouse = function() {
   if (this.term('xterm')
       || this.term('screen')
       || (this.tput && this.tput.strings.key_mouse)) {
+    // NOTE: Latest versions of tmux seem to only
+    // support cellMotion (not allMotion).
+    if (process.env.TMUX) {
+      return this.setMouse({
+        vt200Mouse: true,
+        utfMouse: true,
+        cellMotion: true,
+        allMotion: true
+      }, true);
+    }
     return this.setMouse({
       vt200Mouse: true,
       utfMouse: true,
diff --git a/lib/widgets/element.js b/lib/widgets/element.js
index a445d75..d5b2494 100644
--- a/lib/widgets/element.js
+++ b/lib/widgets/element.js
@@ -342,6 +342,7 @@ Element.prototype.setContent = function(content, noClear, noTags) {
 };
 
 Element.prototype.getContent = function() {
+  if (!this._clines) return '';
   return this._clines.fake.join('\n');
 };
 
@@ -809,7 +810,7 @@ Element.prototype.enableDrag = function(verify) {
   this.onScreenEvent('mouse', this._dragM = function(data) {
     if (self.screen._dragging !== self) return;
 
-    if (data.action !== 'mousedown') {
+    if (data.action !== 'mousedown' && data.action !== 'mousemove') {
       delete self.screen._dragging;
       delete self._drag;
       return;
diff --git a/lib/widgets/screen.js b/lib/widgets/screen.js
index a417e6a..26c19ca 100644
--- a/lib/widgets/screen.js
+++ b/lib/widgets/screen.js
@@ -545,7 +545,11 @@ Screen.prototype._initHover = function() {
     self.render();
   });
 
+  // XXX This can cause problems if the
+  // terminal does not support allMotion.
+  // Workaround: check to see if content is set.
   this.on('element mouseup', function(el, data) {
+    if (!self._hoverText.getContent()) return;
     if (!el._hoverOptions) return;
     self.append(self._hoverText);
     self.render();