OK, GOOD NEWS!
We just found the point which causes login issue on some website. It this is your case. We have two option, please let us know which one is good for you.
- You send admin login details and we fix it right now directly on your website
- You wait for 24-36 hours, we're releasing fixed Media Uploader 1.0.1 version
In other words if you'd like to have all changes of 1.0.1 version version right now you should send login details if not, just wait for that release.