Help index gone missing.

I reinstalled 1.09 and updated to 1.10.
Syncmods updated and all modules rebuilt.
However, the Help / Modules / Index section of the help panel has disappeared which lists all the commands.
Anybody know how to get it back?

If anybody is interested this was caused by precompiled public mods with no included a .bmx file.
I added a dummy .bmx file which included a dummy bbdoc (not sure if this is necessary) and now the help index displays OK.