V4 Collection, Logic 9.1.8 on OS X 10.10.3 (latest update, I think). It all started like this: I was working this afternoon on a piece of music I will have to deliver before the weekend when I noticed the track I wrote for the Prophet5 plugin wasn't playing. Reloaded the plugin and got a message saying something like "This demo is expired, Thank You For Trying Arturia" or something. WTF???!!! Then I went online and loaded Arturia Software Center, which asked me promptly to download its latest version - after installation, it wouldn't let me log in. "The email or password is incorrect." Then I went to the Arturia website, did my login normally and changed my password (I thought it could have been due to an odd character I used in it). Tried again the ASC to no avail.
Some minutes ago, I tried ASC one more time and, again, nothing. So I went to the Arturia website only to find out I couldn't log in. Fortunately there was an email from someone called Amine containing another password and telling me to try again using that. The (temporary?) password I was given at least allowed me to log in the Arturia website, but nothing has changed with the ASC.
About the Prophet5 plugin, it seems to have resumed working normally after I rebooted the computer.
People, I have several plugins and apps by other companies (NI, Roland, iK, Waves). Never had such problems before. Really, I love the V4 Collection - but please guys, get your shit together.