Hi,
I had the same issue and contacted support. Smartbear was able to provide me with a patch which solved the problem just fine. Drawback is it has a negative effect on Internet Explorer's memory consumption, which they want to solve before including it in a new TC version. I close the browser after each test run and open it again before the next, that way the higtened memory consumption has little to no impact on my test experience.
The patch I use is for TC version 12.42.
I recommend you to contact support, I think there is a good chance your issue is the same I had and in that case the patch to solve it would already be waiting for you..
Regards,
S_Seydel