I have seen problems like that when a mouse started going bad. Something to check.
Thanks for the reply Wayne.I have seen problems like that when a mouse started going bad. Something to check.
hallo John,The cause is a disagreement between Java and the graphics card driver. If updating the driver doesn't fix it you can disable Java's use of hardware acceleration as explained here.
Hallo John,Save the modified file to desktop or "My Documents"
Move it from its location to the Program File directory
You will get a UAC prompt to confirm that you want to do that