distorted menus with multiwindow

[J S]

I am running a VMS application on XFree86 (version Server-Test 78) which 
ideally I'd like to run on multiwindows, but when I click on some of the 
menus e.g. File, Edit, Help, not all of the options are displayed, or 
sometimes after the menu has dropped down and back up again, fragments of it 
remain behind on my screen. Is this a bug or is there a flag I can set to 
stop this happening.

If I use rootless mode with window maker I don't get this problem though.

Thanks,

JS.

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