Chrome version 48 update introduced an issue that caused the Visual Experience Composer to function incorrectly in Chrome. Google has resolved that issue and the fix is available with Chrome version 48. Kindly update your Chrome Browsers to version 50 to once again enjoy Target Standard and Premium with Chrome.
For information on the Google issue, refer to https://code.google.com/p/chromium/issues/detail?id=582603.
You may also want to disable Enhanced Experience composer option if it was enabled to work around the issue. Keeping it OFF is always better if your site loads perfectly fine with the option disabled.