Extension conflicts are common reason why chrashes and bombs appear on the computer. If you have Extensions Manager installed, you may hold down the space bar when the computer is turned on. When a screen comes up, turn off all of the extensions. If the crash or bug still happens, then you know it is not an extension bug. Otherwise, if the problem dissapears, you know that it is an extension problem and you can start by turning on only half of the extensions and eliminate which extensions are not the problem and which ones are. In this manner, you can find out the one extension which is causing the confict and remove it.