On one of our localhost installation, the Register and Login Controls have disappeared and instead have been replaced by an image.

I can no longer login to the site. Clicking on Login link or using (ctrl=login) leads to a blank page with an Icon (icon_authentication_32px.gif)

Similarly, clicking on Register or using (ctl=Register) leads to a blank page with an icon (icon_users_32px.gif)

I've never seen this before and was hoping someone can point me in right direction. LoginTabId is not changed (still is set to Null in dB)

DNN Version: 5.0.1

Will be upgrading to 5.1.2 in few minutes; will post if that makes any difference.

What's strange is that we've been running fine for weeks and no changes were made.

Yes, we were using Default Skin; however, I've concluded that skin is not causing the problem here. I've overriden the skin and container to No Skin + No Container and all I get is a blank page.

Following URL returns the Login control only on a working DNN Site:

http://localhost/dnn5/Default.aspx?ctl=login&SkinSrc=%5bG%5dSkins%2f_default%2fNo+Skin&ContainerSrc=%5bG%5dContainers%2f_default%2fNo+Container

However, the site in question returns only a blank page. Upon examining the source, the ContentPane Div is empty...