Bluetooth issue

I have two computers, each one with Bluetooth.

I was always able to send files via Bluetooth from Computer A to Computer B and vice-versa.

Now I can only send from Computer A to Computer B.
When I try to send from Computer B to Computer A, I get this message "FTP service not found on target device".

This is very weird, as it used to work, and Computer A still sends to Computer B.

Any help?

Thanks!

Well, nobody answered my question, but I did something that solved the problem.

I opened the System Configuration (msconfig), and under "startup" I checked "Bluetooth Software".

Now both computers send to each other.

I have no understanding why this fixed the problem, but it did.