Twice in the past fortnight (that I have noticed), a strange icon has appeared in my taskbar. It is red, looks like 'D!' or possibly 'O!' in white text (visually similar to the Filezilla icon), and has 'Broadcaster window' or possibly 'Broadcasting window' in the title. On clicking to examine it, it seemed to be a window with an image (trees maybe?), but it immediately disappeared (hence the vague description). It didn't trip any anti-malware programs, and a full scan with BitDefender and Ad-Aware did not turn up any malware. I can't find anything in the task list that immediately jumped out at me, and no installed programs have a similar icon (apart from Filezilla, as mentioned, and it's not that). It doesn't resemble anything in the system tray. This is on an up to date Windows 7 system.
Google has not helped - even making a fake 'D!' image:
...and reverse image searching it didn't help. (Ditto for an O! image)
Any help identifying this appreciated, either as a nasty I need to scrub off my system, or a benign thing that I can safely ignore. Many thanks.
UPDATE: have identified it as dingit.tv adware - serves out adverts for games. Malwarebytes apparently good at getting rid of it.