I am trying to process a document I wrote in 2009 using mkii. I am modifying it to work with mkiv.
 
When I run
 
context mydoc.tex
 
the process starts and after some time it stops and shows an asterisk (*) waiting for a command. I then type in "\end", and it resumes. Finally it ouputs "mydoc.pdf". There are still some things to fix (ie section numbers) but in general the document is ok.
 
I can't see any "error" message although I got a lot of "Overfull \hbox..." and "Underfull \hbox..." messages.
 
What can be the reason?