Missing menus

[Joe Miller]

Hi I'm using GnuCash 2.4.7 on Ubuntu 11.04 and I'm having a problem with 
missing menus. The unity desktop should display the 'File', ;Edit' etc 
menus at the top of the screen when you move the mouse over the toolbar, 
but I'm not getting anything. I can get a menu to appear by pressing alt 
f but the menu appears half-way down the screen and doesn't stay 
visible. If I use the menu to open a different account file, then the 
menu appears correctly.

Can anybody help me on this? I've been using GnuCash for two years with 
no problems, this has just recently started happening.

Thanks,
Joe