My address book is responding very, very slowly, which makes it useless. I don't need to open it very often so not sure how long this issue has been going for. This morning I needed to make some changes in some of my contact lists. When I open the adress book, it first appears blank for about 30 seconds. Then all my contacts appear but I can't select any nor navigate through my different contact lists (I have only 2 custom lists on top of the default collected addresses and personal adresses lists). If I click on a contact, it takes about 30 seconds to select it, and if I try to drag and drop it to one of my lists it also takes another 30 seconds to complete. I am using the latest version of Thunderbird for mac, latest version of OS X, and everything else is working fine on my mac. I have restarted thunderbird a few times, restarted my mac, nothing changes. Anybody knows what's happening ? Thanks