FrontPage Guru's - Help Needed

Working okay but now can't check out files

[Lextech]

Our tech put in a virtual directory so that we could FTP into the website
files (not necesarily using FP).

Front page created a _derived folder and now we can not check out files nor
save files.

1st error message says "cannot copy file C:\myfolder\myfile.html to
C:\myfolder\myfile.html_sourcecontrol"

Then it says for error 2 - "Server Error: file C:\myfolder\myfile.html is
not checked out"

What do we need to set to correct this?

[DaveAtIFG]

The first person I'd talk to is the guy that set it up, but you've probably done that. FP users, any ideas?

[Lextech]

Unfortunately, the person that set it up is no longer here. We have freed up some of the issues, but have encountered others.

I have noted in other discussions that over a certain amount of files handled by Frontpage causes it to slow or become inoperable because of the size of the site files.

Our web has over 4000 pages, (about 1/3 archive files). We have access to FrontPage again, however, trying to check out the site files causes a file to be generated by FrontPage with the .LCK (locking) extension. We then cannot author or edit the site files.

I am thinking that this is caused by source control. Are there settings that I may be missing (obviously I'm missing something)that is a common thing to check in this instance?