Hello everyone, i read the forums but it may be my first time posting here, so excuse me if this is the wrong part of the site that im posting. I am having some weird problems on my computer since a few days. I am going to post only some examples from the problems I faced in these days. When I turned on my the other day these preferences were lost: - my desktop background picture, - the way my files were organised in Finder (for example they were supposed to be arranged but they were floating around) - then I turn on Mercury messenger and it says that the global preferences are lost and it starts with the regular first time settings. Then I don't remember the order, but everytime I arrange, when i restart the mac, some of the prefs are kept but with some of them having the same lost preference problems again. And then new ones were added each time i reset, including: - lost some preferences in Firefox like home page, theme, - some preferences lost in Adium, - dock item reduced to the regular first time programmes only, - (latest non beta) Safari, constantly unexpectedly quitting after a few seconds i try to open the application (until i update to the latest beta, now its ok) - some add-ons in Firefox including Gears and Forecastfox not working now, - forecastfox had reset itself the other time, then i re arrange my preferences, then I could not even click on OK after doing the settings anymore, now I cannot even choose the location (buttons like OK, apply, Find Code) does not respond, - lost some settings in iCal There are some more problems I faced and also some more that I discover one by one while I turn on the applications. But basicly, I think this shows that there are some serious problems going on my mac. These cannot be all individual cases going on by coincidence i suppose? I firstly wonder, Why this could happen? And second, what should I do now? re-install mac os x? i don't know if it will solve it so I didnt bother to try it yet. As there are no viruses in mac, I do not really think it could be some files that i downloaded cause ths problem, no? My only suspicion, which could be a serious one or not: I am using Filevault. Sometimes I skip the 'save space' menu while turning off the computer, sometimes not, depending on how much time I have. The other day, I decided not to skip it and while waiting, I turned off my bluetooth mac keyboard... and it stopped and went back to the log in menu. Totally out of my control. Could this be the problem? Is there a rule that if you turn off your bluetooth keyboard, Filevault space recovery stops? And all my weird problems are happening because of this? It has been a bit long, but thanks for reading until here at least.... I would appreciate any kind of help or idea. I tried to google a bit but it looks like a very specific problem so I decided to post here. And excuse my english if im not clear at some points... Cheers I am using the latest versions of Tiger, Firefox, etc. on an iMac G5 without a camera (revision B as i remember) with 2 ghz and 1.5 gb ram.