Every software development company, either it is application software or system software, announces newer file versions of their products. The newer versions include a number of added features and to avail latest version every individual upgrade their system as soon as possible, without thinking about the problems he might face while up-gradation.
Like other software, when you look into the Mac forums, you will reveal a number of problems experienced by the users while upgrading to Mac OS X 10.5 Leopard. The problems are ranging from application crashes, lost data, login problems to Blue Screen of Death.
It is becoming perceptible as Leopard is causing more and more problems. Some of the main issues, faced by users so far, are:
FileVault burdens
With Mac OS X 10.5 Leopard, Apple has introduced a new file version of FileVault- 128-bit encryption system for Mac OS X. users of the previous file versions of Mac OS X face problems when they install Leopard over the old OS.
Apple suggest turning off FileVault before upgrading, but it could be very time consuming process and is not always practical. It actually makes an unencrypted duplicate account for which you might not have enough physical space on the drive. FileVault also does not work properly with Time Machine.
Blue Screen of Death
A number of Mac users have faced an uncharacteristic BSOD (Blue Screen Of Death) while upgrading to leopard. Essentially Leopard solicits you to restart your computer once installation is finished, and then your system just sits there with BSOD until you force it to reboot.

Crashes, performance issues
While several Leopard users are apparently sailing without any troubles at all, other ones are experiencing a lot of issues of nightmare proportions. Their systems crash at runtime or in middle of any process and cause several catastrophic situations.
All these problems are extremely serious and could lead to the data loss as some point in time. The loss of precious data can not be accepted by any of the organization or individual user and it needs to be recovered.
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