cannot connect 3rd user to TS

I have a client with the following situation:

Windows 2000 SMALL BUSINESS server (which is their file & exchange
server, and their domain controller).

Windows 2000 TS server (running an accounting package).

Two users have been connecting to the TS server and using the
accounting package without problems since it was installed. One of
these users has a WinXP client, the other is running Win98.

Recently we tried to connect a third user (the VP of Finance, in fact)
to the TS server so that she could use the accounting package. Her
workstation is a laptop running Win2k Professional.

We get the error message "Terminal Server has ended the connection".

We've activated the TS licenses on the domain controller, but that
didn't help at all.

We're at a complete loss as to what to do next.

any help will be greatly appreciated