Tear off menu by dragging caption

Eureka! Amazing I didn't think to try this before. I just had a look in the tlbdata.xml file in the top and second level folders, and found tear-off entries, whose values I set to 0. I then logged off and on again, and TLB now works perfectly, and I can no longer tear off the menus.

I did this just before getting your extremely prompt 'non-hack' solution. Many thanks anyway, Yuri. The important thing is that it's all okay now and I know what to do in future if anything goes amiss in that way again. TLB rules - okay!