Hi! I've been using ESS 5.0 RC1 for some time now, but three days ago I started having problems with Thunderbird 5.0. Whenever I started Thunderbird and it was checking for new mail or I manually check for new mail it got really sluggish or I even get the message that the program isn't responding. I ran the task manager and found out that the CPU usage of ekrn.exe is ranging from 30-50 (I use a dual core CPU). After about half a minute I receive new messages and it's behaving as usual until I check for new messages again. any ideas?