System Cache plugin is off.
In Joomla Configuration Control Panel - System - Cache is off

I have updated CB to 2.0.6

Then, I have cleared the cache.

Again, it worked the first time, but not the following times

I don't know what to do. What else could be forcing cache?

UPDATE:

In IE9, it shows the main screen, not a blank one...

It seems I've solved it.

As you told before, it was a CACHE PROBLEM. I had CACHE activated in my .htaccess.

I removed it and it worked.

I think it won´t fail anymore. If so, I will come back to you.

Thanks.

Jose