Recently active topics in Pownce tagged with client

While the new Pownce desktop app works pretty well all in all, I've recently noticed the following problem:

I try to send a message, pressing the "Post it!" button, which then greys out but the screen does not change. I then have to press cancel and it at least appears that the message sent has been lost.

From then on, depending on how Pownce feels, one of the following things can happen:

1. The message is gone for good.
2. I post the message again and suddenly the first one is there as well making it look as if I posted the same message twice.
3. Posting any message via the desktop client always fails but the website works. Sometimes the lost ones sent via the desktop app reappear, sometimes they don't.
4. Posting a message does not work at all, instead when trying via the website i get the following error message at the top (like right now):
"(1062, "Duplicate entry '2824098' for key 1")"
=> no matter whether I post the same content again or something else!

Any idea what's going on?

It may be a coincedence but my client, even after reinstall refuses to launch properly since the new features were added to Pownce recently.

It appears on the taskbar and in the task manager as running, yet nothing happens visually.

I have even made an exception in Windows firewall to no avail.

I am on XP Home SP2

I use BeyondTV by Snapstream - when I fired it up to watch a show it automatically switches off Aero on the fly, and crashes Pownce. I tried switching it on/off independant of the TV program with the same results. I'm running Vista Ultimate x86.