Tried everything. Unable to open K2 media manager. Only bar with scrolling wheel showing. Please help

Using Joomla 2.5

Hi. Try to:

1. Update K2 to it's latest stable version.
2. Clean your browser's cache.
3. Check your page for javascript errors.
4. Ensure that you are connected to the internet in case you have setup K2 to load jQuesy remotely.
5. Go to Content->Media manager->Options and check that the "Path to files folder" is setup correctly.