Cambridge Computer Recycling wrote:

Regularly, when I return to any of our machines, I find that seti driver is
showing 1 unit ready to transmit, 1 unit needed to fill.  If I click on
transmit, the black box appears briefly, too briefly to read anything, and
then goes, Seti Driver shows no units ready to transmit, but still 1 unit
needed to fill.  I then have to click on transmit again to get the black DOS
box to appear and see the next WU upload.

I've noticed Seti Driver doesn't seem to transmit and receive instantly.
There is a deliberate pause of some 30 seconds or more between actions.
Is that what you're seeing?

If not, what are your settings in Seti Driver? List them all.

And are you running anything else with it, like SetiSpy?

 When I check my stats, no unit
has been credited after this.

Where are you checking your stats? If it's at the SAH website, I believe
they only get updated once a day.