[WhatNot]

There’s manuals on line, but trying to pinpoint a particular problem with each new version, is like try to find a needle in a haystack. :^)

[aquila48]

I hear you...

Have you tried just googling your problem? Chances are some other people have run into the same problem and have the answer.

When I did it, one of the pages it came back was this...

http://blender.stackexchange.com/questions/40029/joining-mirrored-object-causes-half-of-it-to-disappear