I get this too but only with Comodo.
What I do is far from ideal but I'm pretty sure it's down to the latest Adobe flash update as that bar is a shadow of the preloader bar.
1. As it's loading right click on the bar and select 'inspect element'
You then get a script and a section of it will be highlighted in blue,
2. Hit delete, to remove the highlighted text. WGT will go black and hang,
3. Hit the refresh button to reload WGT.
4. This time as its reloading hover your cursor over the area of the preloader bar.
This moves the bar to the bottom right side of the screen, which for me at least, is less of a problem.