Can\'t get *any* version of CVSNT to work with CVCSCC plugin in visual studio

I tried using the plugin with CVSNT version 2.5.01.1910 and whenever I
checked out a file in visual studio and tried to check it back in, I got a
lot of errors.

So I read your site, uninstalled CVSNT and re-installed version 2.0.51d.

With this version I could only checkin/checkout using the cvs commandline
tool, using wincvs, tortoisecvs and you plugin I got the same error

cve [checkout aborted] Can't change to working directory

I checked permissions on all repositories, temp directories, project
directories etc... and they all had permission.

The only change I made now was to go back to CVSNT 2.5.01.1910 and I left
all the directories, repositories and permissions alone and all the tools
work again now other than some intermittent errors with your plugin.

I was wondering if someone can tell me what I'm doing wrong as you guys
recommend version 2.0.51d and I really would like to evaluate the CVSVSS
plugin properly as we have to choose a tool within the next week for
purchase.