I have Ad-Aware SE and set it to run and do a scan on Windows start-up.
For the last 3 days I have got a message each time it starts that my definitions haven't been updated for 15 days and do I wish to update them. When I say "yes" it connects to Lavasoft's server and then tells me that no updated components are available.
What's going on? Ad-Aware used to have new definitions every few days and now I haven't seen any new ones in around 3 weeks.