Webhelp project - loading icon won't go away, menu never loads

I have a HelpCase project I’m working on.

Now, all of a sudden, when I open the HelpCase project the loading icon (attached) stays on screen and the menu strip at the left of the design screen never loads.

I am, however, able to open help files, edit and save them, albeit with the icon whirling about centre screen.

I restored from yesterday’s backup, but same problem. Have also restarted WAMP.

No joy.

Any ideas, anyone?

sc8_whirlyicon.jpg