Creating LOX files sometimes takes a very long time.  One issue appears to be when there are empty objects in a th2 file such as

 

line wall

endline

 

In the list archive Martin Sulka refers to a tool (?) that:

 

There is somewhere a grab to find and erase empty objects from th2 

files in conference.

https://www.mail-archive.com/therion@speleo.sk/msg02978.html

 

Any ideas?

 

Many thanks, Henry