The work on texvc seems to be stuck. I guess the major cause is the language it is written in. Most files were not updated for years, even though there are bugs and feature requests pending.
Maybe even more important is the fact, that it is difficult to compile the extension without root access, because mostly none web hoster has an Ocaml compiler installed. If there would be any chance to use a script language, you chould do it.
*Any* language would fit better. (C, perl, …)
IMHO you should drop texvc at all in favor of mimetex/mathtex.