SCC API - Issue with check out after Adding Project

[Fred]

We have discovered and issue with the SCC API Provider from
StarTeam.

The issue is after you added a Solution/Project under source control,
if you than modify a file, and does not get automatically checked
out ..

But if you perform a manual Check Out & Check In from the menu first,
than after this if you then modify a item (or file) it does get
automatically checked out..

We notice that after the adding of the Solution/Project under source
control, the files are not marked as ‘read-only’, where as they are
after the manual Check Out & Check In.

Our suspicion is that this is the cause the of the problem, i.e. if I
mark the files as ‘read-only’ after the adding of the Solution/Project
under source control, it also works ok.

Is this an know issue ? and if there a fix/work around available ?