following a discussion on tex stackexchange, i've made a small change to the moreverb package: it now only allocates a write stream if the document uses the verbatimwrite environment.
i've now installed the new version on ctan and updated the catalogue repository.
Users may view the package's catalogue entry at http://www.tex.ac.uk/tex-archive/help/Catalogue/entries/moreverb.html or browse the package's directory at http://www.tex.ac.uk/tex-archive/macros/latex/contrib/moreverb/
The catalogue entry will change (somewhat) overnight tonight.
Robin Fairbairns
For the CTAN team