Visual compare not working in 4.0.1204?

Hello, I upgraded to version 4.0.1204 and the Visual compare is not working correctly anymore. It's completely messed up, I have to click and unclick the visual compare button to make it work, but it's working inconsistently. It was working perfectly before the update.

System info:
+- System -----------------------------
Microsoft Windows 7
Service Pack 1 (Build 7601)

CPU Speed : 2926 MHz
Total Memory : 8151 MB
Free Memory : 5084 MB

+- SmartFTP ---------------------------
Version : 4.0.1204.0
Time Stamp : 2011-07-04 18:01:14
Platform : x64
Id : 400039615
Maintenance : 2013-06-21
Days in use : 262

+- Language ---------------------------
en-US

+- Internet Explorer ------------------
Version : 8.0.7601.17514