Glad you found the problem. 5.2 is pretty old, I guess. I should ask my webhost if they can update it.
I don’t think other plugins can be the cause, since one of the blogs don’t have any installed, but the issue still appears.
I just asked my webhost and they said they use php 5.2 on my server.
Strange indeed. I tried to install it both ways: through WordPress and via FTP. I also tried different blogs – same error every time I’m trying to activate it. All the blogs are hosted on the same host, so I’m starting to think it might be it. I don’t have any problems with any other plugins, though.
